Maybe it’s for filling little soy sauce fishies…

They are, as you rightly said, quite small. I’d just never imagined funnels that small!

Those may be for dolls or for filling tiny jars / cremation memorial jewellery

Ahem

Those would be for decanting perfume

Maybe you need to make a lego kitchen with teeny tiny spice jars that need filling. Or make and furnish a dolls’ house. Just to make sure they don’t go to waste.