You can set a linear dimension to use the sheet plane, but it won't calculate correctly. But it might work if you overide the value and place notes instead. Or you might be able to place a linear dimension and hide an arrowhead, exension line, etc. to make it look like a leader. But I don't know of a way to get a leader note to park on a model plane.
I suppose you could cheat and place some small circular phantom part in your assembly to use for placement of a diameter dimension and then overide it to use as a leader note.
Thankfully this is an oddball drawing, and we don't normally do this. I recall back in the horse & buggy days having to create special text styles in AutoCad to do this on isometric drawings for a show and tell. RRRG!
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