I can confirm that there are a couple of updates here, as structs can now be easily used in functions and created in forms: but unfortunately still not usable as defaults for forms in the workshop:
If anyone knows if this will soon be enabled, please let me know as this would really solve the issue that I raised in Action Tables → Workaround to delete rows/replace existing objects - Ask the Community - Palantir Developer Community, since the number of items I have to update are easily manageable in struct form instead of table form