a) not in out-of-the-box OBIEE
b) you can do what you want with D3js or Oracle JET or <Insert Library Of Choice Here>
I'm not familiar with either D3js or Oracle JET. Are those separate products? Are they included with the standard OBIEE suite?
Looking into our current system, I notice something else. My predecessors on this project were able to accomplish exactly what I am describing. Unfortunately they are not available for me to ask. The attached screen shot shows the setup they used to create another pie chart.
I tried to duplicate this setup with my own pie charts, and that is when I get that long winded error message. I'm guessing there is something else they did to get this to work. Perhaps it's one of the two solutions you mention? But where to do this -- that is the question.
No they are visualization libraries which can easily be used in OBIEE:
Prodney / Admin123
This is the D3 library: http://d3js.org/