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No it doesn't work that way. If I have NSO and download the NES app, any profile on the system can play it just like how any profile can play any game I download.
But those other profiles aren't able to play online or upload cloud saves without NSO. They would need an individual membership or be on a family plan.
So my guess is you will be able to download Captain Toad if your Japan account has an individual NSO membership, or is part of a family plan.