Stars are not tabbable for screenreaders

Hi dudo,

i built a public/goverment website, which includes a rating function with YASR.
EU Govermental websites must/should be accessible to people with disabilities.

The stars to rate cant be tabbed so it cant be used by people with screenreaders.
So i am trying to implement a different approach with individual tabbable stars.

I tried it with jQuery, but without luck.
I always getting
Not a valid Json Element, rating can’t be saved.

My idea is to implement alternative stars that can be seperatly be tabbed and clicked on the frontend. Once a star is clicked an ajax call should be fired to save the vote.
Can you point me into the right direction, how to trigger a proper ajax call?

Thanks in advance
best
Marc