How to inject a scoped service into a singleton service?

DIscoped.cs

public class SomeSingletonService(IServiceScopeFactory serviceScopeFactory)
    : SingletonService
{
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        using IServiceScope scope = serviceScopeFactory.CreateScope();

        var dbContext = scope
            .ServiceProvider
            .GetRequiredService<ApplicationDbContext>();

        // Do some background processing with the EF database context.
        await DoWorkAsync(dbContext);
    }
}