Ability to add outgoing transfers to shared tabs

I have a shared tab with my boyfriend and we regularly send each other £10 or so when the other person is stuck. I’d love to be able to add this to the shared tab to keep track of things. At the moment, I just add a custom payment with the amount, but it would be much easier to simply pick the ‘Sent money’ transaction from my transaction list.

Better yet, if I send money to a Monzo user that I currently share a tab with, it would be lovely if I could automatically be given the option to add that transaction to my shared tab (with the bill split defaulting to 100% for that person)