Your shaders will most likely work unless you've made a super expensive shader,
but Shader Forge is primarily aimed at pushing visual quality,
so most things are done on a per-pixel level, rather than per-vertex.
There are some quality settings you can alter to make lighting cheaper, but in general it's best to stick to unlit, relatively simple stuff on mobile. There may come an update to make it easier to deal with vert/frag separation in SF.
That said, some companies are using SF to prototype shaders though, and then optimize it for mobile use later, which seems to work very well!