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Idea: You could create a custom field that pulls the information from the structure field. But you would need a separate custom field for each field.
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Idea:( But I don’t know if panel hooks work when site.txt is updated). Create a hook that writes the options to a json file that is available via URL. Then you could add that URL to the options query.
External API support for dynamic field options
You can now simply pass a URL for options to fetch a JSON array with keys and values for options:
label: Select field
type: select
options: http://myoptionsapi.com/options.json
Make sure the JSON is in the following format:
{
'key1' : 'value1',
'key2' : 'value2',
'key3' : 'value3'
}