Android Hilt inject an Application Singleton to a non Android class

I have a class that I want to be a Singleton in the App.

@Singleton
class SomeManager @Inject constructor() {
       .....
}

I want to inject it into a regular Kotlin class:

class UserManager @Inject constructor(
private val someManager: SomeManager,
private val isValid: Boolean = false){
    ....
}

But when I create the UserManager I do: UserManager(true) I get:

The boolean literal does not conform to the expected type UserManager

What am I missing? How can it be done?