My colleague who works with your Support case notified me that they already had internal ticket to investigate your query. And I wanted to share the solution in this thread as well.
To get the quote number:
{{ QUOTE_PROPS.hs_quote_number }}
To get the object ID of the quote:
{{ QUOTE_PROPS.hs_object_id }}
These are the Hubl tokens you'll want to use, hope this helps!