The closest I've got to this is:
Create a Google Forms asking for "ActionName" "Summary" "NumberOfFields" "FieldType" "FieldTypeFunction" "FieldName" "FieldQuestion", record the answers to a sheet file.
Download sheet file. Open MS Word and select as MailMerge sheet file source.
Paste the HeroKit Action template in the MS Word document and place the MailMerge fields appropriately.
MailMerge Finish > Edit individual documents. Save.
Mass convert files to .cs.
That's Fields done, but I couldn't wrap my head around implementing multiple fields easily in this method.
Doing the actual action file would basically have me coding in Google Forms, which made this not worth it. So I've given up on it.