Baking a glossy part to Unity

Newbie here , have some questions

1

The left side is a part of my model,i want to export it to Unity(as a game object)

And the question is…i don’t know how to make the glossy part in Unity!

I tried to bake the roughness,normal and color map and the right side is the result in Unity

I can change the whole model’s metallic but i don’t know how to make only the red part become glossy, the glossy part is made by shader nodes ,is there any why to make it?

sorry if i asked the stupid question :frowning: