Evaluate leadership through questionnaires is not an ideal measurement, in my humble opinion. I strongly believe that we should measure the results (or the effectiveness) of such leadership on different levels such as, cultural aspects, productivity, etc.
In the same vien, this below article tickled the problem of leadership questionnaires and suggested three strategies to measure leadership.
https://hbr.org/2021/05/3-strategies-to-reduce-bias-in-leadership-assessments
Skill Up & Thrive 