Enums in GraphQL issue

Can you replace enum resourceType of GraphQL with something else? GraphQL variables supported in queries are only int float string bool: https://dgraph.io/docs/query-language/graphql-variables/

I am trying to make payloads look better. $resourceType should be string but not enum as follows:

// GraphQL POST PAYLOAD
const FString PostPayload =
	R"(query speckleCommentsFetch($id: String!, $archived: bool!, $limit: int!, $resourceId: String!, $resourceType: String! )
			{
				comments(streamId:$id, archived: $archived, limit: $limit, resources:{resourcesId: $resourceId, resourceType: $resourceType){
					items{
							authorId
							replies{items{authorId replies{items{id}}
							reactions
							archived
							viewedAt
							screenshot
							text{type,doc}
							createdAt
							updatedAt
							data resources{resourceId,resourceType}
					}	
				}
			}
	)";