At this time, we do not have the feature to pass Stripe processing fees onto your studio members. One of the reasons why is that some countries and states do not allow processing fees to be passed on to them.
If you want to see this feature in the future, please submit the idea on our Product Roadmap.
We suggest increasing your membership price by the percentage you pay Stripe. For example, if a membership is $120 and Stripe is 3% plus .25, we suggest making the membership $123.85. This will increase your Stripe fees since your price increases, but the member will be paying more.
Another option is to create a product called Membership Fee and charge it to all accounts that purchase a membership.