How to declare enums suitable for json-schema (as string type) and protobuf emitters

[icmtolentino]

I would like to define an enumeration that would be emitted to both json-schema and protobuf. It is required that the json schema treats the enums as a string type. However, the proto emitter requires the enumeration to be declared with numerical values.

example:

enum planetsEnumType{
mercury : 0,
venus : 1,
earth : 2
}

model planets{
name : planetsEnumType;
}

/** PROTO output: */
enum planetEnumType {
"mercury" = 0;
"venus" = 1;
"earth" = 2;
}

message planets {
planetEnumType name = 1;
}

/** JSON output: */
$id: planet.yaml
type: object
properties:
name:
$ref: planetEnumType.yaml

$id: planetEnumType.yaml
type: number
enum:
- 0
- 1
- 2

How can I make the json schema output treat the enum as string type?
Is there another way of defining numeric enum values for protobuf?