Motion Tokens (Easing & Duration properties) or allowing to create a custom property for Composition

[shleesavia]

Animation or motion design is essential part of the design language that many designers to use to communicate with users. Some of building blocks of motion like "easing" & "duration" properties can be created as tokens and many design systems (Material, Lighting, Spectrum etc) have already adapted this method to build consistent animations. It would be very helpful if we can have "Motion" tokens anytime soon!

If adding "Motion" tokens to the plugin takes a long time, an alternative way would be allowing users to add a custom property in Composition or somewhere else.

Thank you