g suite – Only seeing Arial, Comic Sans & other basic fonts in Google Sheets chart legends — how to use Google Fonts?

I am only seeing 12 fonts available for charts in Google Sheets, and no option to add others. Is this a bug or by design?

Steps to reproduce:

  1. Right click on a chart in Google Sheets
  2. Select Legend from the menu
  3. Scroll down to Legend font and see the following:

enter image description here

I’d like to see Google Fonts like Montserrat and Playfair display on this list, instead of just Arial, Comic Sans, Courier New, etc.