How to only regenerate the paths for which data has been changed in netlify CDN

I am trying to develop a blog app with NextJs with contentful and trying to host it in netlify. I have set the stale-while-revalidate for each pages as well. If a content in contentful got changed, i am listening to a contentful webhook and getting the details of the content which has been changed. But i am unable to find out any detail from the netlify blogs on how to regenerate only that page with the updated content in netlify using on-demand builders.

I’m assuming you’re asking about on-demand ISR. This post should give some details: Question - timeline to support on-demand Incremental Static Regeneration (ISR) on Netlify?

TL;DR: Support coming soon