I’m trying to set up a timer-controlled zwave outlet for some really dumb kitchen appliances (like the T-Fal air fryer which has a built-in timer that can only beep). I couldn’t find a in-wall outlet with a timer built-in, so I figured there has to be a way to put the timer in HADashboard. The closest I can think of is a dimmable light widget (since it can control and monitor a numerical value at the same time), but I have no idea how to create a timer entity that mimicks a light…Or is there a much better way than this? Thank you for your advice!
here on the forum there are examples to be found about creatings timers and alams on HA.
the most common way is to create an input slider and an automation that let it count down after an input boolean it set to true.
after you have created that in HA you can expose that with dashboard.
Yes, this isn;t really a task for the dashboard - it is about status display and manual intervention. You could do what ytou want easilt with HASSs built in automations or using AppDaemon.
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Thanks for the above replies. Yes I am aware that I need to write some script to implement the countdown logic in the background. AppDaemon looks very easy to use and I am quite proficient in Python, so I think that part is fine. I just wanted to know which dashboard widget(s) would make most sense. Afaik hadashboard does not support developing custom widgets yet (I was informed via the beta version posts so I may be wrong).
After reading the docs one more time, I think I should stick with the input slider widget and backend 
Will report to you guys if everything is set up successfully. Many thanks!
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IF you want to display status, a good way of doing that is with template sensors that you can then display on HADashboard. Good luck!