kubectl krew install rolesum

brew install Ladicle/kubectl-bindrole/kubectl-rolesum

$ kubectl rolesum -h  # or kubectl-rolesum -h
Summarize RBAC roles for the specified subject
Usage:
  kubectl rolesum [options] <SubjectName>
Examples:
  # Summarize roles bound to the "ci-bot" ServiceAccount.
  kubectl rolesum ci-bot
  # Summarize roles bound to the "developer" Group.
  kubectl rolesum -k Group developer
SubjectKinds:
  - ServiceAccount (default)
  - User
  - Group
Options:
  -h, --help                   Display this help message
  -n, --namespace string       Change the namespace scope for this CLI request
  -k, --subject-kind string    Set SubjectKind to summarize (default: ServiceAccount)
  -o, --options                List of all options for this command
  -c, --cluster-only           Ingore namespaced Roles and show only ClusterRoles
      --version                Show version for this command
Use "kubectl rolesum --options" for a list of all options (applies to this command).