Make Shrikhand as done in this post. Once the shrikhand is ready, chill it till mixing.
For the sauce, melt the dark chocolate, add cocoa powder, add sugar, butter and blend everything well.
Finally, add the cream and temper it well, until everything sets properly.
Allow it to cool.
Slowly mix this to the hung curds. Transfer and chill again.
Garnish with chocolate chip before serving.