Grant access to all nested/subcollection at once

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Hi, can’t find a way or an answer to this:

How/is it possible to grant access to a user to a collection and all subcollection at once ?

We have a main collection called “Supplier” and all suppliers nested below it as subcollection. When I have a new user, I found no other way to give them access to all collection one by one… Is it a way to give access to all nested collection at once ?
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Thank you