Link between different Post Types

Hi Dennis,
is there a way to connect elements of different post types in the newer versions of this plugin?

I read, that someone asked this a few years ago, when there was no such a filter available: https://wordpress.org/support/topic/posts-to-pages-to-custom-posts/

But maybe this has changed in the meantime. Nowadays, Is there a way to extend the dropdown output to also include other post types?

Thanks a lot!