Retrospective bill splitting, including from non-Monzo accounts

I am really enjoying the bill splitting feature within monzo, particually with other monzo users. However, often when I split a bill with people who don’t have a monzo account they will transfer me money through a traditional bank transfer (with their own reference) in their own time.
When this happens it would be really helpful if you could select the incoming payment and manually group it back together with the outgoing payment that it was meant to reimburse, then allowing it to be represented in the same way as a normal bill splitting payment.