Retrieve field blueprint name toStructure

How to retrieve data from a blueprints when there are structures?

It’s OK for simple data:

$options = $kirby->user()->blueprint()->field('bio');

or

$options = $kirby->user()->blueprint()->field('sex')['options'];

It’s OK

To search in a structure and a substructure how to do?
here is the simplified result of the dump:

    ["athlete"]=>
    array(5) {
      ["label"]=>
      string(10) "L'athlète"
      ["icon"]=>
      string(4) "text"
      ["columns"]=>
      array(1) {
        [0]=>
        array(2) {
          ["width"]=>
          string(3) "1/1"
          ["sections"]=>
          array(1) {
            ["athlete"]=>
            array(3) {
              ["type"]=>
              string(6) "fields"
              ["fields"]=>
              array(3) {
                ["size"]=>
                array(5) {
                ["bio"]=>
                array(4) {
                  ["label"]=>
                  string(3) "Bio"
                  ["type"]=>
                  string(8) "textarea"
                  ["width"]=>
                  string(3) "1/1"
                  ["name"]=>
                  string(3) "bio"
                }
              }
              ["name"]=>
              string(7) "athlete"
            }
          }
        }
      }
      ["link"]=>
      string(21) "/account/?tab=athlete"
      ["name"]=>
      string(7) "athlete"
    }
    ["social"]=>
    array(5) {
      ["label"]=>
      string(12) "Suivez-moi !"
      ["icon"]=>
      string(4) "text"
      ["columns"]=>
      array(1) {
        [0]=>
        array(2) {
          ["width"]=>
          string(3) "1/1"
          ["sections"]=>
          array(1) {
            ["social"]=>
            array(3) {
              ["type"]=>
              string(6) "fields"
              ["fields"]=>
              array(3) {
                ["url_strava"]=>
                array(4) {
                  ["label"]=>
                  string(11) "Lien Strava"
                  ["type"]=>
                  string(3) "url"
                  ["width"]=>
                  string(3) "1/2"
                  ["name"]=>
                  string(10) "url_strava"
                }
                ["social_events_listing"]=>
                array(5) {
                  ["label"]=>
                  string(10) "Historique"
                  ["type"]=>
                  string(9) "structure"
                  ["fields"]=>
                  array(3) {
                    ["social_events_date"]=>
                    array(5) {
                      ["label"]=>
                      string(4) "Date"
                      ["type"]=>
                      string(6) "number"
                      ["max"]=>
                      int(2050)
                      ["width"]=>
                      string(3) "1/2"
                      ["name"]=>
                      string(18) "social_events_date"
                    }
                    ["social_events_listing2"]=>
                    array(5) {
                      ["label"]=>
                      string(13) "Sous-texte(s)"
                      ["type"]=>
                      string(9) "structure"
                      ["fields"]=>
                      array(5) {
                      ....
                        ["social_materials_listing2_select"]=>
                        array(6) {
                          ["label"]=>
                          string(4) "Materials"
                          ["type"]=>
                          string(6) "select"
                          ["default"]=>
                          string(11) "materials_default"
                          ["options"]=>
                          array(3) {
                            ["materials_default"]=>
                            string(0) ""
                            ["materials_1"]=>
                            string(8) "Material 1"
                            ["materials_2"]=>
                            string(22) "Material 2"
                          }
                          ["name"]=>
                          string(32) "social_materials_listing2_select"
                          ["width"]=>
                          string(3) "1/1"
                        }
                      }
                      ["name"]=>
                      string(25) "social_materials_listing2"
                      ["width"]=>
                      string(3) "1/1"
                    }
                  }
                  ["name"]=>
                  string(24) "social_materials_listing"
                  ["width"]=>
                  string(3) "1/1"
                }
              }
              ["name"]=>
              string(6) "social"
            }

There is a first structure social_events_listing then a second social_events_listing2

I would like to reach social_materials_listing2_select which is built in the same way as the select sex

Just go down further in the array, do get the field, which returns an array. Then get the field key in that array and then the name of the field. On phone, so can’t type code properly. If ned be, check how to access arrays in php