Pattern Matching on Discriminated Unions Without `_tag` Discriminator

I am trying to use the pattern matching functionality on a discriminated union type. Using

Match.value(...)

Match.value(...)

on the sub-field works, but it doesn't typecast the object. I see

Match.tag(...)

Match.tag(...)

, but that says it only works if the discriminator is

_tag

_tag

. I have a lot of discriminated unions that do not use

_tag

_tag

and I'd like to avoid re-working them all if I can. Hoping someone here has suggestions