Allow formula custom fields in features

I was following this idea but was dissapointed that the calculated fields are limited to worksheets. 
I would need fields that are visible directly in Features and feature cards that are the result of a simple operation of other number fields, either custom fields or Scoring fields. 

End goal is to have the ability to use my scoring and effort calculations and generate a ranking with 
R+I+C+E/Effort

https://big.ideas.aha.io/ideas/APP-I-3555