The normale split bill functionality is simple, yet not so powerful.
I suggest a toggle to enable it working with percentages, possibly with real time calculations on other percentages.
Example: suppose I’m splitting a bill with other 2 people, i set my charge to 50%, and revolut automatically set theirs at 25% each.
It seems to me like a very “basic” option, try to implement it (note, WITH A TOGGLE, i think not all users would like to use it this way)