Group separator

In my Keycloak I have multiple groups and a few users.

Some of the users are part of multiple groups therefore I have enabled multivalued mapper for the groups.

My question is what is the default separator of the values in the multivalued claims when I get the token and can I change them?

From what I have seen the default is a new line, but it is not intuitive so I’m not sure and I didn’t find any solution to change the separator.

Appreciate any help.