List of defined enum values

[Alfus]

Change
I would like to be able to test a value against the list of defined enum values for a given enum type.

I am trying to replicate the feature, as seen in https://github.com/bufbuild/protoc-gen-validate/blob/main/validate/validate.proto#L702

Example
foo.myEnumField in package.MyEnum.values()

In the validation rules, the type of the enum cannot be given statically in the program, so it would also need to work on the type
foo.myEnumField in enum_values(type(foo.MyEnumField))

Alternatives considered
A custom helper function in every CEL language