how to mask font-awesome icon in quasar button?

[peterPanParker]

i tried:

<q-btn flat size=“sm” color=“secondary” ">
<i class=“fas fa-pencil-alt” data-fa-transform=“shrink-10 up-.5” data-fa-mask=“fas fa-comment”></i>
</q-btn>

but it did not work… i want to get something like this: