Hi,
I have contacted the developers of the Software (Themler) that I use to build themes, and it looks like that at the moment they cannot add this kind of feature to their software.
An idea that I had was to copy all the theme’s contents from my front-end website and past it into the WordPress editor, in this way Yoast sees all the contents like if they were written in the editor and not in the Theme and it starts to give me feedback on how my contents are build. Would this work? Or it can cause any kind of conflict with Web Crawlers?