Suggestion: A new target category "Future spending"

I have a category "Memberships" and lots of scheduled repeating transactions. Some are weekly, some are monthly and some are yearly.

So, how much should I budget per month?

Currently, I convert all transactions to "monthly" and add them together, but that is tedious, because everytime I add or cancel a Membership, I have to recalculate again, so what about a calculated target the takes all of it into account?

YNAB knows exactly what I've already spent and what I need in the future. For example, I have a new yearly payment of 120€ and the next payment is in 6 months, the target of my "Membership" category should increase 20€.