Allow group members to assume specific role

group_policy.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "123",
            "Effect": "Allow",
            "Action": [
                "sts:AssumeRole"
            ],
            "Resource": [
                "arn:aws:iam::XXX:role/eks/ROLE"
            ]
        }
    ]
}

role_trust_policy.json

    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::XXX:root"
      },
      "Action": "sts:AssumeRole"
    }