Load to Source impedance match for non-constant load impedance
In general, a method to match such a network can be started by looking at the cause of the impedance shift. In your example, it would apear you have a resonant short at \$f_m\$ and resonant shunt at \$f_n\$. If you model those with poles and zeros you can tune them out in a more complex matching network.

More advanced would be using a method where you do some kind of polynomal fitting of your load. You can then use that in your matching network equations to generate the neede impedances versus frequency to match this, and then see if you can find a easy way to implement them with L/C/resonators/transmissionlines and so on.