How do I install the xmltoolbox library in Octave built into plecs

As far as I understand, the simulation scripts built into PLECS use the built-in octave, but it contains too few library files to support my other tasks. How do I install other octave libraries to complete the function.

Or to put it another way, how do I change the values in my xml model in simulation scripts, e.g. thermal chain or Rgon, Rgoff.I need to change these parameters to implement batch, automated simulations. I can only change the voltage, current, and other parameters in the circuit through simulation scripts, but I cannot change the parameters in XML to meet my needs。

Perhaps this new forum post will help you achieve your desired simulation:

Co-Simulation with Scripting for Changing Thermal Parameters During Simulation