Thank you for giving me an advice.
We're working on final project at school, on which we have to write a plugin to manage presets/filters like Lightroom or other image processing applications, our MyEffectConfigToken includes a List<Pair<Effect, EffectConfigToken>> and I want to write it down on disk. If you have any better idea, please let us know.
Thanks again.
*Edit: I've found that I can serialize the Property of PropertyBasedEffect effects, but I don't know how to deal with "non-property-based" ones.