It`s not there..At the FCOM 2 you will find just for the standard 2,1/2.5% ...
Did you find the "Obstacle Clearance Charts - Take-ff path"? I realise that we are talking about go-around, but use the chart (and a pencil) and you should be able to work up something based on where the obstacle is located, what flap conf you use for the go-around, and what altitude you begin your go-around from, etc, etc
It's the same data that your performance engineers use.
That said, the calculatation (Perf Data) must come from an approved source before you can use it - computer, data set, etc.