Command Timeout parameter in postgresql connection string is not working properly in npgsql

Question

I am trying to configure command timeout within the connection string as follows:

`"ConnectionStrings": {
    "EFCoreConnection" : "Host=localhost;Database=EFCoreCommandTimeoutTest;Username=postgres;Password=postgress;Command Timeout=300"
  }`

but when I debug and evaluate dbContext.Database.GetCommandTimeout() method call inside my api handler I got null only. I am aware that I could configure command timeout when I configure npgsql as follows:

`builder.Services
    // .AddEntityFrameworkNpgsql()
    .AddDbContext<AppDbContext>(options =>
    {
       options.UseNpgsql(builder.Configuration.GetConnectionString("EFCoreConnection"),
            config => config.CommandTimeout(300));
    });
`

but that's not what I need, I am trying to configure that inside connection string because we use Azure App Configuration and we store connection string in there and we don't want to introduce another secret in Azure App Configuration for only command timeout. We are going to store the command timeout along with connection string and that's my goal here.

I tried to use the connection string example from here but still got null when I evaluate dbContext.Database.GetCommandTimeout() method call. I was sure that my connection string is correct according to this documentation.