Create methods with reflection in Go

I'm trying to write a mocking library in Go and I create mock structs with reflection like this:

mockStruct := reflect.StructOf([]reflect.StructField{
    {
        Name: "Field1",
        Type: reflect.TypeOf(0),
    },
    {
        Name: "Field2",
        Type: reflect.TypeOf(0),
    },
})

mock := reflect.New(mock).Elem()

Is there any way to create methods programmatically on these structs?

Thanks in advance for the answers!