My application is highly dependent on spa framework so is there any other way to index infinite scroll for SPA applications
"Infinite scroll doesn't hurt SEO as long as you also have other navigation as well as deep links to your content"
But take note of the last part.... you also have other navigation as well as deep links.
It means you want to make sure there is a reason for people to want to stay on the page and read it.
However, the nice thing about segmenting pages instead of trying to fit hundreds of paragraphs on a single page is that users can find what they want quickly and they won't have to wait for all text to load and they won't have to constantly scroll to find the paragraph they want.
If you don't want to use previous and next, then you should look into categorizing your paragraphs and having one web page per category. If that doesn't condense it enough, then introduce subcategories. Make all the categories as links so that people can use them to find the page they need.