Completely agree that this is needed. You can't even re-use a custom name due to delete custom item type (template) - i.e. When I made "Bank Account (PIN Passworded)" and realized a new field I didn't add, I can never use that name again. Have to go with "Bank Account (PIN Passworded) v2" or something unfortunate like that!
I've been a paid user for 11 years and lackings like this may push me to 1Password, Bitwarden, etc.