Can the typeGraphql custom decorator be used on ordinary functions?

[willdx]

I have a requirement:

1. Get the data object
2. Get the cache of the data object
   I hope to add a cache to these two steps, and finally return the merged data to the front end. The code is as follows, but it does not seem to be effective

@Resolver(() => Property)
class PropertyOperatorResolver {

@resolverCache("property_image_translation")
 async get_image_translation(image) {
      // get image translation info
 }

@resolverCache("property_image")
async get_property_image(property_id) {
    // get image data from db
}

 @FieldResolver()
  async image(@Root() root: Property, @Ctx() context: Context) {
        const property_image = await get_property_image(root.id);
        return await get_image_translation(property_image);
  }

}

So is it because there are restrictions on the decorator of typeGraphql? Is there any way to achieve my needs?