Great suggestion! As of now we don't have this feature. You can send us a feedback here: https://yt.be/help/a4gp . While every individual feedback may not get a direct response, we do review everything and use the details to work on it.
Understood! You can cancel your memberships at any time by following these steps on a computer under 'Update or cancel a channel membership' here: https://yt.be/help/Moze . Hope this helps.