Need help with versioning

[jorgenfaunaapp]

I am using yarn in my CRA app, and using the yarn version command to update my package.json version number. But I have a hard time figuring out how to load the version number from my package.json and show it in the frontend. I have looked at the following stackoverflow question:
https://stackoverflow.com/questions/45978230/get-version-number-from-package-json-in-react-redux-create-react-app
Which solution should I go for?. Getting the $npm_package_version looks promising, but I do not know how to do that in our environment on heroku.

[ChristianMurphy]

https://stackoverflow.com/a/50822003 should work across environments.
$npm_package_version is set by NPM, as long as the build is called through npm (npm run build) it should be set correctly on any environment.