Hi,
yes, you can use Content Plugin into SQL custom where parameter.

for example:
users with same interests:

Custom SQL Where: interest LIKE "%{user interests}%"

docs about Custom SQL Where parameter at http://docs.easy-profile.com/article/sql-custom-where
docs about Content Plugin at http://docs.easy-profile.com/index.php/article/content-plugin

Sorry i try to explain better.

I'd like to add a filter inside the frontend page on witch the map moduled is diplayed (or inside the module) to let the user filter for example records having same values (es: filtering for City)

hi,
sorry this is not possible, you can only sync maps with a menu items of type User List or User List (Table) and add a search user module like our "User List" page (https://www.easy-profile.com/users-list.html).