Get the time of last edit of pull request description via API?

Can I get the time when the description (i.e. the first comment created along with the PR) of a pull request was last edited? The updated_at field of /repos/{owner}/{repo}/pulls/{pull_number} is updated when any part of the PR is updated.
I tried to be hacky by passing id from forementioned API to the comment url, but it returned a 404.

maybe what you can do is to simply have a list of record of the updated_at field and the corresponding content, right? so you’ll know each changes, and when it was last modified,

Hey! I also want to know this. Do you get the solution? Kindly share with me. Regards: https://mowershub.co.uk/