Support custom environment variables nested into common variables

[GrexyLoco]

I recently tried to adjust my launchsettings file in a .NET 8 Blazor Server App a following way:

{
"iisSettings": {
"windowsAuthentication": true,
"anonymousAuthentication": false,
"iisExpress": {
"applicationUrl": "http://localhost:33691",
"sslPort": 44366
}
},
"profiles": {
"Development.Local": {
"commandName": "Project",
"dotnetRunMessages": true,
"launchBrowser": true,
"applicationUrl": "https://localhost:7187;http://localhost:5252",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development.Local"
}
},
"Development.Server": {
"commandName": "Project",
"dotnetRunMessages": true,
"launchBrowser": true,
"applicationUrl": "https://testserver",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development.Server"
}
},
"IIS Express": {
"commandName": "IISExpress",
"launchBrowser": true,
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
}
}
}
}

As you see i tried to use 
- "ASPNETCORE_ENVIRONMENT": "Development.Local"
- "ASPNETCORE_ENVIRONMENT": "Development.Server"

I even more tried things like:
- "ASPNETCORE_ENVIRONMENT": "Development.https.Server"

But it seems like i am not supposed to do that as my UI breaks this way. 

What I like:

Beeing able to define custom values for environment nested into common ones, so i can also organize my appsettings in a nested clear structure.