Sometimes text icons are very small indeed, see below:

Is there anty way I can target icons only with CSS? Often it's simply a matter of increasing their font size, but if I can't target only icons then text becomes massive in comparison.
You can do it with pango markup atm, e.g.
"format": "<span font='12'>{icon}</span> {capacity}%"
It works with pango, but it screws up text's vertical alignment too like in this screenshot, where "archimago" is a text going with the icon in the following way, for instance:
"format": "<span font='22'></span> ~ {}",
"exec" : "cat /etc/hostname",

Most helpful comment
It works with pango, but it screws up text's vertical alignment too like in this screenshot, where "archimago" is a text going with the icon in the following way, for instance: