Style and size in Rendering

[KarypidisParis]

Hi! Thank you for this awesome lib.
I'm using your lib to create a IconField in my models. My issue is that I can't pass the 'size' parameter when I'm using the Rendering option.
Examle, when I'm writing this:
{{ quiz_icon.as_html size='fa-3x' }} <--- This is not working
I'm getting this error: Could not parse the remainder: ' size='fa-3x'' from 'quiz_icon.as_html size='fa-3x''

Instead, I can do that to create an icon with the default rendered.
{% fa5_icon 'check' size='fa-3x' %} <--- This is working

Is there any workaround for that?
Thank you in advance