Substitute all i's for alternate i

Design
1

Im not sure if a topic like this has been discussed here on the forum but I am looking for a way to substitute all i’s for an alternate i as well as j’s.

My font has an i with square tittle and the alternate has a round version, same with the j. Is there a way the user can substitute all the i’s and j’s in their text for the alternate round tittle version

Thanks

2

This is what the stylistic set feature are for: https://glyphsapp.com/tutorials/stylistic-sets