Tried to google if this is possible but wasn't successful.

Will try to illustrate:

All wordpress themes comes with a pre-designed blog structure.

Elementor and other page builders are unable to modify the theme's blog.

Can you point me out the best direction to search the info? thanks!

Maybe I haven’t understood the point. If you’re talking about Wp websites that you host (so not the blog service of wordpress.org) Reboo allows you to edit both pages and blog posts. I’m not sure about the wordpress.org hosting service cause I don’t know if it allows you to install plugins and put a custom code into the header. But if you can do it then Reboo is compatible