How do I add globally installed prettier package (using nvm)?

I followed the instructions here: https://www.jetbrains.com/help/webstorm/prettier.html#ws_prettier_install

I cannot select prettier as a valid package installation. It is greyed out:

If I manually type the path it is marked red.

which prettier

~/.nvm/versions/node/v14.18.1/bin/prettier

Prettier is available in the integrated terminal.