[Update] I found a solution to solve this problem.
Add a “Description” to ENUM.
http://spec.graphql.org/October2021/#sec-Descriptions
So I am schema
> enum USERTYPE{
>
> "users account"
>
> USER
>
> "admin account"
>
> ADMINISTRATOR
>
> "supperadmin account"
>
> SUPERADMINISTRATOR
> }
In query,
> query {
> # previous queries
> __type(name: "USERTYPE") {
> states: enumValues {
> name
> description
> }
> }
> }