Schemas are not generated for FHIR data models

[AkselKP]

I have a simple C# web API that uses FHIR models from the Hl7.FHIR.R4 nuget package.
For example, these are some of my method signatures:
public Bundle Create(Patient patient)
public Patient Get(string id)

The schemas for these resources are not created.

I found this reported issue in the Firely SDK, but I can't seem to figure out how to use the suggested solution, if it's even possible anymore.
FirelyTeam/firely-net-sdk#2103

Any help would be greatly appreciated.