FNC Blox + TMS Web Core

I'm consiering using FNC Blox in my TMS Web Core project. I see in the docs how to register new blocks (the star example) using code. But I'm wondering if it is possible to create new blocks using the editor itself? For example, create a the star as a bunch of lines and then save it to the block list? Might want ot create a library of such blocks and I'm thinking it would be more than a little tedious to do it via code.

PS: Tried adding this Q to the FNC Blox category but the +New button was not enabled.