Hi noaha64975596,
If you have a single Track with Keyframes in your Time Line, the XPresso> Track Node can read out the values of a Track if provided with a Time.
Example
https://www.dropbox.com/s/6eisus3rmlkr2dd/CV3_S26_drs_22_XPtt_01.c4d.zip?dl=0
https://help.maxon.net/c4d/s26/en-us/Default.htm#html/GVTRACK.html?TocPath=Menu|||Track Operator|_____0
Typically you drag the object that has the keyframes into the XPresso Editor. This creates a node, and you can access this.
If you like to copy and paste values, a matching Track must be available to paste them in.
Using the “Set Driver, Set Driven” function could be done by setting up User Data to be “driven”.
If nothing works: Can you share the file zipped Below 4MB? If the Mime type creates trouble, I can send an upload link.
All the best