...and speaking of Apex...We’re also allowing you to populate dynamic items by returning a JSON in one of the supported formats to dynamically load a DropDown, Checkbox, RadioButtons or ListButtons:
The supported Formats are:
[{"value":"Nikita"}, {"value":"Dima"}]
[{"label":"Nikita"}, {"label":"Dima"}]
[{"label":"Nikita", "value":"123"}, {"label":"Dima", "value":"222"}]
["Nikita", "Dima"]
Watch how you can now Populate dynamic items via Apex in FormTitan
Enjoy!