shader of 2 or more sprite inside with more emission?

[lavish vector]

I'm a beginner and I have a problem.
I have this shader with a texture (the player's base sprite) and an emission of that texture, but they later created other sprites, and I need to import them into the same shader and give them emission effects. How do I do that?
Some of them have more than one emission, and I haven't found anything online that helps. Thank you very much in advance.

[pearl rivet]

https://docs.unity3d.com/Manual/sprite/sprite-editor/secondary-texture/secondary-texture-landing.html
"Secondary textures" allows a sprite asset to have more textures associated with it, with a references visible to the shader