Google Fonts of theme and how can we add font-weight

Hi, in scriptcase 9.4 how can i use google fonts font-weight in theme?
you can add font with different weights. but there is no option in theme settings for font weight. only bold true or false…
for example for form form labels font weight 600 for headers font weight 800 etc.
https://fonts.googleapis.com/css?family=Nunito:200,200i,300,300i,400,400i,600,600i,700,700i,800,800i,900,900i&display=swap

thanks.