Convert Integer to time and then schedule a notification on this time - flutter

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First I have to convert the integer to time (which I've managed to do so far) and then I want to schedule a notification on that time. You see that checkbox, When someone taps then alarm is set. So I don't multiple alarms. And most importantly I can't flutter default time picker (That works) but I can't use since I'm setting the alarm with my default time picker.
Now I want to take that value and convert that to time and set a notification on that time. Thanks everyone in advance Alarm App Screen
I've tried flutter local notifications package but I can't seem to figure out how can I take the integer value and set it to schedule notification.enter image description here
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Thanks
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