dialogflow agent doesn't have build-in entities such as @sys.unit-length

Question

I am building my first Google dialogflow agent but the most of the build-in entities described here are missing. https://cloud.google.com/dialogflow/docs/reference/system-entities

I am looking for @sys.unit-length in particular.

Could the problem be that I am defaulting to a non-english language?

Answer 1

Yes, the available system entities depend on the language, many are not available for languages other than English. Scroll down to the examples section on that site, there is a dropdown field to filter by language.