How to get only data (exported) fields from protobuf struct with reflect?

My proto file look like this

message DeviceOption {
  string ApID = 1;
  string Other = 2;
}

After run protoc, the DeviceOption struct generated like this:

type DeviceOption struct {
    state         protoimpl.MessageState
    sizeCache     protoimpl.SizeCache
    unknownFields protoimpl.UnknownFields

    ApID  string `protobuf:"bytes,1,opt,name=ApID,proto3" json:"ApID,omitempty"`
    Other string `protobuf:"bytes,2,opt,name=Other,proto3" json:"Other,omitempty"`
}

Now, in server I wanna parse all available fields using https://pkg.go.dev/reflect. My code is like:

v := reflect.ValueOf(pb.DeviceOption{
            ApID: "random1",
            Other: "random2",
        }) 
for i := 0; i < v.NumField(); i++ {
    // Do my thing
}

v.NumField() returns 5, which means it includes all the fields, including state, sizeCache, unknownFields which we don't want. We just want ApID and Other.

Is there any other way to let reflect return only data (exported) fields, and ignore metadata (unexported) fields?