custom profile fields – adding prefix to url

Hello, I recently discovered peepso and I like the plugin so far. Planning to migrate my buddypress community to peepso. I’d like to ask something.

In the profile fields I want to add url fields that have prefix urls.
For example lets say, I want my users to add their instagram username to this field. so I need this field to be non-editable https://instagram.com/ prefix. So when a user types their username the link will be automatically https://instagram.com/username.

how can I manage this?
I’d appreciate any kind of help.
Cheers.
Baris