Function/computed field type

Scope & Context


Currently, on objects we can only add txt/number/boolean and date field.

It woould be great to add a computed field that use the value of other fields to calculate it's own value.
For instance a field calculating the estimated opportunity value following the number of employees on the company.
Or, using the same use case as illustrated in #2534, a field that count the numbe of opportunities or closed deal by referer.

A notion like approach could be inspiring :
![image](