How do I assert types for route params?

when I declare a new file route, such as:

createFileRoute("/listening/top/$entity")

createFileRoute("/listening/top/$entity")

is it possible to assert or assign a type to

$entity

$entity

? in my case I'd like for it to be an enum with

artists

artists

tracks

tracks

albums

albums

but I can't figure out how to extend it beyond a

string

string