Get reflect.Type statically without creating an object

I have this Go code:

type Op interface{}
type Op1 struct{}
type Op2 struct{}

I'm trying to map Types to int. Something like this (pseudo-code):

mapping := map[reflect.Type]int
mapping[Op1] = 20
mapping[Op2] = 30

I know this is possible by creating an instance of Op1/Op2 and call reflect.TypeOf:

op1 := Op1{}
op2 := Op1{}

mapping := map[reflect.Type]int
mapping[reflect.TypeOf(op1)] = 20
mapping[reflect.TypeOf(op2) = 30

but my question is if it's possible to do that "statically" without creating an object. Something like .class in Java.