For example, if you want to run your command "clear cache", there is workaround to achieve it on WorkCron. Below we present a way using PHP script (for other scripts or platforms, you should find corresponding solution easily):

1) create a "agent" php script with following code:

echo shell_exec("clear cache");
2) Place this agent php on your webserver
3) add a cron job on workcron:

The above workaround should do the same job of running your command "clear cache" in CLI.