[Intune] Deploying a .pkg file to MacOS clients where a configuration.json is required?

[Garacesh]

We want to deploy FreshWorks' discovery agent to MacOS clients. The problem is the .pkg file comes with an associated configuration.json file containing parameters that I assume need passing to the installer (AccountURI and RegistrationKey), and I can't see a way of providing that information to intune? I can load in the pkg no problems, but that's it. 

 

I've seen some chatter about using pre/post-install scripts, but nothing that actually explains how to do it. Alternatively, I've seen discussions around using application configuration profiles, but those only seem to be applicable for mobile clients (iOS, iPadOS and Android). 

 

Anybody got a hookup to a decent guide that explains how to achieve this? Or know if it's even possible? Macs, er.. ain't my strong point.