I actually require an cron expression to automatically restart an app at 8 am every day. for that I have to create an scheduled webjob in azure but i'm not getting the exact cron expression.
According to your description, if you want to created a scheduled WebJob which will fired at 8:00 AM.
I suggest you could try to use below cron.
At 8:00 AM every day: 0 0 8 * * *
More details about how to set the cron, you could refer to this article.
Result:

Besides, if you want to make sure your web jobs will continue worked. I suggest you should enable the "Always On" setting to be enabled on the app.
About how to enable it, you could refer to below steps:

Notice: This technique is available to Web Apps running in Basic, Standard or Premium mode
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