Rewrite feed

Hello,
Thank you for this amazing plugin. My theme allows me to put only one link as http://domain.ltd/feed/. And of course, I get 404 page.
I would like to rewrite http://domaine.ltd/feed/ to http://domain.ltd/en/feed/ if pll is english or http://domain.ltd/es/feed/ if the page is spanish.

I tried different htaccess things that don’t work.
Is anybody can help for the right syntax to do so?
Thx a lot.

https://ww.wp.xz.cn/plugins/polylang/