is it possible to wait a running task when gracefully shutdown?

[rider11-dev]

1. Hi,i'm using IHostApplicationLifetime(aspnetcore3.1) to shutdown my webapp,like below:
endpoints.Map("/stop", async (httpContext) => { var logger = httpContext.RequestServices.GetRequiredService<ILoggerFactory>().CreateLogger("ApplicationStop"); var sw = new Stopwatch(); sw.Start(); var applicationLifetime = httpContext.RequestServices.GetRequiredService<IHostApplicationLifetime>(); applicationLifetime.StopApplication(); sw.Stop(); await httpContext.Response.WriteAsync($"app stopped in {sw.Elapsed.TotalSeconds} secs"); });
2. It worked and requests in process have chance to finish in certain time(configured by HostOptions.ShutdownTimeout).
3. That is to say,when applicationLifetime.StopApplication called,the app wait a certain time for requests to process.
4. So,i wonder if it is possible the app wait some time for a runing task before shutdown?some task like below:
`
endpoints.Map("/task_sleep", async ctx =>
{
var logger = ctx.RequestServices.GetRequiredService().CreateLogger("task_sleep");
int.TryParse(ctx.Request.Query["sec"], out int sec);

                Task.Run(async () =>
                {
                    logger.LogDebug($"task_sleep begin");
                    if (sec > 0)
                    {
                        await Task.Delay(TimeSpan.FromSeconds(sec));
                    }
                    logger.LogDebug($"task_sleep end");
                });
                await ctx.Response.WriteAsync($"start a task to sleep{sec}s");
            });

`
thanks!