Page builder on post content (not template)

Hello,
I wrote my problem here https://themeforest.net/comments/20793623 and after installing the cloud library plugin I can finally edit post templates. Thank you, but my third question wasn’t really answered.
How I can actually use a pagebuilder on the post content itself? I mean not to edit a template, but for edit the post itself. For example I want to be able to insert colums in the text or add divs and change the background etc. Actually same as editing a template but editing the post content. I hope you get what I mean.
I’ve already read some other posts here in the forum which asked the same question and you say that it’s just not possible and we should use the WPBakery plugin instead. If I edit a post with that plugin, will I still be able to use the template for it + sidebar etc? Will it just edit the post content or the whole post will have an empty template and I have to build it from scratch without sidebar?
However, if I activate it, I can’t edit any post at all anymore. If I click “edit”, I just get “Error 500”. If I deactivate WPBakery, I can edit my posts again.
Do you plan to support posts-content by the TDcomposer in the future? Or at least give it support for third-party plugins like Elementor. That would be great. I don’t see any possibility to add simple things like colums, divs with bg etc. in a post right now at all. For example on other websites I always used Elementor and it worked perfectly. I could add textboxes, divs with content etc.
I have to say that it’s really disappointing for me to use Newspaper so far, since it is only possible to write simple text (with pictures) and nothing more as posts.
Greetings