'Send email using data from pivot table

I want to ask for help regarding my project. I want to send emails to all users that have a certain group_id.

This is my pivot table

For example, I want to send an email to all users who have group_id = 1, so how do I want to call the email column in the User table with the respective condition?

$group = Group::find($req->groupID);

Mail::send('newmeetingEmail', array(
    'groupName' => $req->groupName,
    'meetingDate' => $req->meetingDate,
    'meetingTime' => $req->meetingTime,
    'meetingDesc' => $req->meetingDesc,
    'meetingLink' => $req->meetingLink,
    'meetingModerator' => $req->meetingModerator,
), function ($message) use ($group) {
    $message->from('[email protected]');
    $message->to($group->creator->email)->subject('Class session');
});


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