Retrieve unique identifier of a synonym / map entity value to synonym group

Let’s say I have an entity “brand”, that can take values like “Nike”, “Adidas”, … and I have defined my synonyms such that rasa knows that “nike” and “Nike” mean the same. How can I make use of this information? The value of the entity will be “nike” or “Nike”, but how can I get one identifier for all synonyms? In those cases where rasa has learned that “nikee” is also a brand, it would be especially useful to map it to “Nike”, since this particular value doesn’t appear in my synonyms. But even if that’s impossible, it would be annoying to always look through all synonyms to map a value to the unique identifier of the synonym group.

Have you looked at synonyms?

Ah thank you!