@somesoni2, does such conf need to be in an app by a specific name? For example, I've had some quirks with the user-prefs config that may or may not have to be in an app with the specific name of user-prefs. I never got a chance to get to the bottom of it but maybe you know if @erinboudreau needs to take any such precautions?
I'm not aware of any app name constraints for times.conf configuration. AFAIK, it can be under any app and the scope/sharing permission on the custom time config, as defined in .meta entries, will decide if the custom time conf is available for use in timerange picker.
The user-prefs.conf is special configuration file which has the constraints that either it has to be under an app called user-prefs (under etc/users/UserName OR etc/apps) OR should be defined globally within other apps OR in etc/system.