Parameters can be animated using Timeline Keyframe Layers.
A Keyframe Layer allows parameter values to change over time.
To add a keyframe:
Right-click the parameter name
Select Add Key
This creates a keyframe in the timeline using the current parameter value.
The parameter will now follow the timeline animation.
The Main Timeline should be defined in the project settings so the system knows which timeline to use when creating keyframes.
Project → Project Settings → Processes