Creating posts with tagdiv composer

Hi.
I want to use a flex block in my post, for this I want to use a tagdive composer, but apparently it can only be used when creating pages.
Perhaps I’m wrong, but in the documentation I did not find a description of using the tagdiv composer when building a post. Is this true?

Hey
I may have phrased the question incorrectly
Here’s an example:
I have 120 artist-singers on the site, and the post created for each artist should have a flex block 5 with a filter by tag for the artist’s name
From what I read in the documentation, it follows that I have to create 120 post templates and apply each individual template to each artist. This will make a terrible mess, won’t it? Or is this the only way?

Thanks for the answer
But that won’t work.
In my case, the post displays announcements of publications under the tag of the singer and at the same time from the category of song cards. example: https://delodillamusic.com/enrasta.html
This is double filtering and only applies to an individual artist.

If there are no other ways, then you have to either make 120 templates or make these posts pages – pages allow you to work with them through the tag div composer.