You can now also add custom queries in the membership same way as in the event registration process.
In Membership - Setup - Member Fees, for every member type there is now an additional edit button.
For every member type you can activate the custom queries.
Same custom queries are available as in the event setup.
Here an example setting:
In the application process, (after selecting a member type) the applicant now get following page in case custom queries are activated for the selected member type.