I have a similar issue to this: Connecting LUIS dialog to form dialog and mapping the right fields
Except I am using built in entities in LUIS such as builtin.number, which I have given a name in LUIS e.g. Amount, but the mapping seems to only be between the field type in the form class and the entity type in the LUIS JSON. Obviously I can't have a field named builtin.number.
How would I go about mapping built in LUIS entities with a form field?