Make 10 copies of your object and give them s shader thats progressively more trasparent and swap the isntace out in isntancer. Thats the 3rd and 4th answer.
However it is possible to do this its just that autodesks mr exporter is made in a bit retarded way* and its not easy to do a shader like this. Its possible tough just a bit convoluted. If your comfortable writing c and compiling mr shaders then i can give you a walk tough on how to do this properly.
*well thing is the mi stream seems to have absolutely no design principle behind it whatsoever, or then its designed totally wrong way around. Its not like designing it in way that makes more sense is impossible. Maybe its due to the fact that they wanted to go the bundling way but still...