Can I add stroke to the texts?

If you want to add stroke to your texts, meaning something like  this, then you should go into the font manager, and there you could enter a stroke css code to the "Extra CSS" option, like this one:

color: white;
-1px -1px 0 #000,
1px -1px 0 #000,
-1px 1px 0 #000,
1px 1px 0 #000;

And that would create this effect on your text: