I want to fecth data from table by passing a foreign key of another table using sequalize

I have 3 tables in my DB. Vendors, Products and Questions. Questions table has a foreign key of products and products have a foreign key of vendors. How can I get all questions regarding a single vendor by passing a vendor id from front end? I want to show all questions on vendor dashboard posted to a particular vendor’s products.
What I have tried right now is, get all product ids by vendor id and fetch questions then by those product ids. But it creates 2 queries with second query I have to map all product ids and query will run on every product id.

Is there a way I can do this in a single query by Sequalize?
Like I pass vendor id and then by vendor id it gets all products of that vendor and then get all questions that are on his/her products.

Thanks