Keyword Difficulty

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

Rank Math isn’t really a dedicated keyword research tool. Here’s a link for more information:
https://rankmath.com/kb/keyword-research-with-rank-math/

You can achieve that by using dedicated keyword research tools/applications life ahrefs:
https://ahrefs.com/keyword-difficulty

Hope that helps.

Thank you.