What is the best way to separate the structure of the html page and display this content in the Bitrix admin?

Question

1C-Bitrix

There is such an html - the structure of a non-standard page.


I have several such pages, they are generally similar, but after the text there are different sections.
For example, here it is an image gallery in front of the footer, while others have a section with feedback or a block with materials.

It seems to me that there are many output options, but I am swimming in the decision on how best to do this, so I want to know how you would do it.