How to determine if a PR has all required codeowner approvals using GH REST API?

Question

I would like to use the GH REST API to determine if a particular PR has all required codeowner approvals. Then, if the answer is yes, I would like to further determine the date and time at which the final approval occurred.

I have tried a bunch of things.

The documentation suggests that if all approvals have been granted, the requested_reviewers and requested_teams array will be empty. This does not appear to be true though. As a test, I created a PR that required reviews from 3 different teams. Then I manually added a couple of additional people. I reached to people from the 3 different teams and asked them to approve my PR. After doing this, in the GH html webpage, it shows "Changes Approved" with a green checkmark. But when I do the GH API request, the requested_reviewers and requested_teams arrays are not empty.

I then tried appending /reviews to the end of the request URL, to get all of the reviews. They all show up as APPROVED, but nothing in the response indicates whether the review was a required review, or someone who was just passing by and felt like hitting approve.

It feels like the best way is to do the following steps:

1. Get the pull request object
2. Examine the requested_teams field (we don't use individual names in our CODEOWNERS)
3. Walk the list of reviews by querying the /reviews endpoint
4. For each one, query the user's teams and see if any of them match any of the teams in requested_teams.

This is a lot of work and pretty complicated, but it seems do-able in theory. Is there a simpler way?