Hi R0J0hound , thanks for the comment.
About canvas Eren fixed and now we have a version that allow effects and works in the same way that paster on runtime and the same problems on export. Also he added fill path with gradient/texture,etc... but this FX things seems is too complex.
So, hope somebody with JS skills can fix the problem. In case is a big task, i'm willing to pay.
I recently launched my Vector Drawing app made with C2:
kronbits.itch.io/vecmaker
And well, the ability to use effects/shaders will give a lot of options for creativity, speed up some work and add cool things.