Add transactions on behalf of other family members

I make some expenses on behalf of other family members such as kids, parents so I need somewhere to specify whose expense it is in the household. They are my transactions done by me and I don’t expect repayment, but for accounting and budget purposes, it makes it easy to see my own spending or money spent for kids expenses, etc.

I try to use tagging right now but it’s not an ideal solution since multiple tags doesn’t mean transactions are split across those entities.

Currently participants can be added only via iCloud so request to add a feature for adding multiple people to the app for whom expenses can be made by participants.

This is how I imagine the fields:
Participants - users of the app (already there)
People/payer/entities field - on whose behalf the expense was made. (eg. kids, parents, grandparents, participants themselves). Admin should be able to create entries in settings as we do for payees

Multiple selection should be possible if expenses is shared between multiple people. Eg. me and spouse goes for dinner - then I can select both of us in people/entity.