There is no option to directly import a set of coordinates to define a path at the moment.
The only way I can think of would be to write a Python routine, but I don't see a function that supports that.
You can find more about the Python API here:
https://wiki.reallusion.com/IC8_Python_API.
Here is a suggestion: using the API you should be able to create and place props as markers according to the coordinates of your path and then you could shape the path according to those markers.