You can get them by adding a non-default field qualifiers, so the url will become /<form_id>?fields=id,name,qualifiers.
I did not find it anywhere in the official docs. But for new FB features, poor documentation is pretty common.
Output example
{
"id": "1234567890000",
"name": "test form",
"qualifiers": [
{
"field_key": "first_name",
"label": "First Name",
"question": "First name",
"id": "777888999000111"
},
{
"field_key": "last_name",
"label": "Last Name",
"question": "Last name",
"id": "111222333444555"
}
]
}
David source
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