List of issues that releated to PR (by merges)

Hey folks,
I want to get the list of issues by PR Number.

SO scenario like this:
Imagine that we have a PR.
The PR has commits.
And those commits have #ISSUE_NUMBER
So each commit has its message with the issue number related to an issue.

I'm looking for a way to get those issues by providing a Pull Request number.

Could anyone please let me know?