Steam Rich Presence in Unity (SteamWorks)

I would like the rich presence in SteamWorks to output: Total Levels: XXX where XXX is the variable in the script.

https://partner.steamgames.com/doc/features/enhancedrichpresence

Variable is a double, doubleTotalBusinessesOwned
The C# unity script uses SteamWorks.
Steam has a token file that is uploaded to the website.

Please only apply if you know SteamWorks and have looked into rich presence.