Not able to change VS Code Font Family

I am fairly new to VScode, I wanted to add Ubuntu Mono Font in VScode. I downloaded the file from Google Fonts page. I extracted and Installed all the different Styles that were available. Here is a photo of the downloaded fonts that I had installed.

Then to verify whether the font was installed or not I opened a word file where I could select Ubuntu Mono. On Stackoverflow I came across 2 methods of Changing the Font family, either editing the settings.json file or using the GUI in VScode by writing the Font family name. I am attaching my modified settings.json file here

I tried other options as well like:

   "editor.fontfamily":" 'UbuntuMono-Regular', monospace"
   "editor.fontfamily":" 'UbuntuMono-Bold', monospace"
   "editor.fontfamily":" 'Ubuntu Mono' , monospace"

   //here I tried to play around with spaces:
   "editor.fontfamily":" ' UbuntuMono ', monospace" 

but whatever I do it is showing the same default monospace font. Any Guidance Regarding this will be helpful. My VScode is updated(It shows March 2021 (Version 1.55)) If any more information or Screenshots are required please let me know.

I tried it with the OTF version: UbuntuMono-Regular.otf

Install the font.

The following settings worked.

"editor.fontFamily": "'Ubuntu Mono', monospace"

You have to RESTART VSC