I was wondering whether it is possible to keyframe certain image properties such as contrast, shadows, highligts, saturation, dehaze, texture etc... in LRTimelapse.

Because I'm shooting day to night transition timelapses and the changes I made in the day time doesn't look that good at night. For instance I want the shadows to gradually scale back as night falls. Is this doable?

Yes, of course, that's one of the main features from LRTimelapse :-)
Basically you set keyframes on the images that you want to edit, edit them differently and LRTimelapse will calculate transitions for the develop settings of the images inbetween.
Please watch the tutorials to learn how it works: https://lrtimelapse.com/tutorial/