I suggest using this plugin developed by me, vim-simple-guifont: https://github.com/awvalenti/vim-simple-guifont

Then you can do:

" This check avoids loading plugin when Vim is running on terminal
if has('gui_running')
  silent! call simple_guifont#Set(
    \['Cascadia Code PL', 'JetBrains Mono', 'Hack'], 'Consolas', 14)
endif

For more details, please check the plugin page on GitHub.