Couldnt find any example on how to use the stack option.

It should exist an example at: https://mdbootstrap.com/docs/vue/content/icons-usage/

to make it simple to understand, orelse I'll need to check the gitlab code to see how it was implemented. :/

This is what I would do if I was using the code directly:https://jsfiddle.net/tagliala/9k5vgr6q/4/

Thanks

EDIT: I saw that the fa.vue is not ready for simple use of stack/layers/masks, could be a good improvement to do. I'll make my own component for now.