formula fields - Feature request

I'm moving from Airtable to Ontraport, and, while there's lots I like about Ontraport, the lack of a formula field makes app development quite challenging.

I often want to do something like: 

• Add 4 weeks to a date and output that value in a field, so there's a due date field visible on a record.
• Subtract today's date from a future or past date to get the number of days between them.
• Concatenate a few fields together into a string and output that to a field
• Have a field value change based on the value of one or a few other fields

I know there are some workarounds available to this, but I'll need to do some of these via webhooks to Make.com scripts, which doesn't feel fun compared to my previous experience.