api-client/packages/hoppscotch-selfhost-desktop/src/api/mutations/CreateRESTChildUserCollection.graphql

mutation CreateRESTChildUserCollection(
  $title: String!
  $parentUserCollectionID: ID!
  $data: String
) {
  createRESTChildUserCollection(
    title: $title
    parentUserCollectionID: $parentUserCollectionID
    data: $data
  ) {
    id
    data
  }
}