@Nennad we’ll definitely take the feature request into consideration.
With very few and small exceptions (some targeting criteria types are simple, straight-forward enough its ok) the Ads API doesn’t currently return any values or messaging intended to be served directly to end-users. All API messaging and content is currently very developer focused.
The expectation is that partners consuming the API will handle the user experience and presentation layer from within their application and API responses, key names, error codes, etc. should not be displayed directly to end-users.