If you are bored to attribute every project pull request one by one and always to the same persons, you can configure github to do it for you.
Managing auto-assignment to your team
These settings will define the rules to assign pull request to people of a team. If you want to restrict to some people of an existing team, the easiest way is to create a dedicated team of reviewer.
Follow the step in doc access and configure it : https://docs.github.com/en/organizations/organizing-members-into-teams/managing-code-review-settings-for-your-team
For one of my team, we are 3, then I managed the settings as follow
Manage codeowners
Then, you need to configure the codeowners of your repository. Set .github/CODEOWNERS file. Simple exemple :
* @org/team* is a regex, the rule will be applied for all PR
@org/team is the team which PR will be assigned
To go further : https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
Note that this configuration file should be set to target branch to be effective.