[QUESTION] How do I set font family with Google Fonts?

[rivetingpeppermint]

I want to set font family for my HTML widget using Google Fonts. Here's what I've tried:

TagWrapExtension(
  tagsToWrap: {'body'},
  builder: (child) {
    return DefaultTextStyle(
      style:
          GoogleFonts.robotoFlex(letterSpacing: 0),
      child: child,
    );
  }),

That approach caused my HTML to display without any wrapping (the whole horizontal width of the content is displayed), like so:

While the desired result is something like this:

Is there another approach I can use to use Google Fonts with the HTML widget? Any ideas would be very appreciated.