Fonts - Typeface

I have installed Google fonts on my typeface and assigned to the Typeface number.

What I couldn’t figure out is when I use for example Helvetica Neau - or other fonts… And when I select the typeface assigned with an “Overide Weight” and select the font weight to 100 it shows the correct output on Preview. However when I view it on the Browsers - i.e. Safari and Chrome it doesn’t show the 100 weight on the font which I want it to be thin (Very Light in the case of the Helvetica Neau).

Please help. Thank you.

I don’t believe Google Fonts offers Helvetica Neau as an option.