Group notification for a github project

When supporting/participating in an open source github project, is there a way to setup a notification that can be sent to a group of individuals that are part of a separate organization?

Example, company A participates in a project and if there are issues/PRs that are tagged as something company A would be interested in have a notification go to that company. We considered a “fake” account that is shared by members of company A but that wouldn’t work so wondering if a team/group could be setup where it is managed by company A and can have members assigned so that a notification can be sent to the members of that team/group.