You can use this node in order to create stretchy joint chain driven by an IK solver without creating any additional nodes or expressions. You can use “Enable” attribute to change the result of the stretch effect. This attribute allows you to adjust stretch level as needed during the rigging and animation process.
Base on rigging requirements you need, this node can be connected to squash stretch or translate stretch node in order to get different type of stretch effects. The node also allows the rig to be scalable.