generate high voltages from arduino and extensions (-50V to 150V)

Hi all

I’m looking to generate a voltage of -50V to 150V across a capacitor. So current will not be an issue (mA s).
The voltage should be controllable in steps of at least 1V and the voltage output should have stability of 0.1V (peak to peak).

Although I googled and searched the forums, I haven’t found any hints on how this could be accomplished by the arduino itself, or an extension of it (shields?)
I’m sorry if the answer to this question is trivial, but I have basically no clue about electronics.

Cheers