Split workload unevenly per person

I’d like the ability to split the effort unevenly if two owners are assigned to an item, where Person A does 80% of the work and Person B does 20%. Current functionality is limited to an even split between the two owners. The ability to split the effort unevenly would allow us to use the workload functionality.

Just adding my voice here. We have quite a few tasks that involve multiple people, eg an editor, reviewer, supervisor, …
The only workaround I found is to create subtasks for each person and assign effort in subtasks. Then set the workload view to display subitems. It is too much work though just to get around the limitations of the tool.
It would be good to know if assigning effort per user is on someone’s radar.