Trenly I think you are on to something. I went through wingetcreate again and added the AppsAndFeaturesEntries. wingetcreate gives me a YAML file, but my repository only accepts JSON files. Unfortunately, I am stupid and do not know how I would go about converting this to the format that would be accepted by the JSON. Any assistance you could provide would be much appreciated. Below is the relevant part of the YAML file that I would need to be in JSON.

AppsAndFeaturesEntries:
- DisplayName: SAP GUI for Windows 8.00 32bit  (Patch 3)
  Publisher: SAP SE
  DisplayVersion: 8.00 Compilation 1
- DisplayName: SAP Business Client 8.00
  Publisher: SAP SE
  DisplayVersion: 8.00 PL0
- DisplayName: SAP PDFPRINT for SAP GUI 8.00
  Publisher: SAP SE
- DisplayName: SAP Business Explorer
  Publisher: SAP SE
  DisplayVersion: "8.00"
- DisplayName: 64Bit RFC Controls
  Publisher: SAP SE
  DisplayVersion: "8.00"

Originally posted by @Smith8154 in microsoft/winget-cli#3674 (comment)