You could check out some marketplace widgets, like the Mendix Time Input Widget or other time pickers and include them in your project.
I would use different approach here.
Store as DateTime (recommended if you’ll calculate with it)
Create an attribute of type DateTime in your entity.
In your Page → Input widget, use a Date Picker / Time Picker but hide the date part:
Go to Properties → Display options, set it to Time only.
This way the user only selects HH:mm.
Internally, Mendix will still store a full DateTime (with today’s date), but you can ignore the date part in your logic and only use .formatDateTime($yourObject/TimeAttr, 'HH:mm').