how to set env variable for yarn installed package?

Question

I installed babel-cli package via yarn globally

yarn add babel-cli global

I need to set env variable.documentation says bin folder should be here

~/.config/yarn/global.

inside there are 4 js files. here is the path but i could not set it.

~/.config/yarn/global/node_modules/babel-cli/bin$

i did try all combinations: instead of ~, i placed home, i omitted last $ sign, i omitted . from .config. I could not figure out.