Passing image url/object to slibling field in structure?

Kirby 3 Questions 🤔
1

Hi there,

I’m making an online comics editor.

I would like to upload an image, get it wide and full column width then draw rectangles over it (via custom field) to make the bubbles (dialogs).

What should be the best way to achieve this ? I can’t figure how to get and pass the image url of the previous field of the sames structure to custom component in blueprint.

Here is an excerpt of the blueprint :slight_smile:

chapter_pages:
              label: Chapter pages
              type: structure
              fields: 
                chapter_page_image:
                  label: Image
                  type: files
                  layout: cards
                  multiple: false
                chapter_page_case:
                  type: custom_component_to_create
                  source: "{{ image from chapter_page_image }}"

In my custom component the ballons should look like :

chapter_page_balloons:
                  label: Balloons
                  type: structure
                  fields:
                    chapter_page_balloon_text:
                      label: Text
                      type: writer
                    chapter_page_balloon_xstart:
                      label: Start Horizontal
                      type: number
                      width: 1/4
                    chapter_page_balloon_ystart:
                      label: Start Vertical
                      type: number
                      width: 1/4
                    chapter_page_balloon_xend:
                      label: End Horizontal
                      type: number
                      width: 1/4
                    chapter_page_balloon_yend:
                      label: End Vertical
                      type: number
                      width: 1/4

Anyone has a clue ?

Thanks a lot !

Gauthier