How to check visualizations in iframes

Hello,

I just started a position as a BI Developer and part of my job is to check
our tableau visualizations for accessibility. In the past, I used wave
chrome extension, but wave doesn't seem to scan charts and visualizations
since they are inside iframes. Would anyone know how I can check charts and
visualizations for accessibility? Is there a tool for that? Any type of
information is greatly appreciated.

Thank you very much.

Best,

Mehrnaz