How to get Google to index dynamically loaded content?

Question

Search Engine Optimization

There is a very large article (actually a book) that is loaded via js. A search for phrases from it shows that google stubbornly does not index this page.
Question. How to make it indexed? In theory, he has been able to process js since 2014.

Answer 1

And what prevents you from doing it humanly / the old fashioned way on html and / or php pagination?

Answer 2

https://prerender.io/

Answer 3

For bots, a separate conclusion is made.