It is surely complicating the issue unnecesarily to notate the chords to indicate major or minor unless the chord required varies from the normal triads generated by the root note of the chord in that particular scale.

So

I   is always major
II is always minor
III is always minor
IV is always major
V   is always major
VI is always minor
VII ? probably never written on a chart, would be indicated by V7 instead, I imagine.