Power, graph delta as vertical axis but as a share of baseline take-up rate

[Jack Reimer]

I am running power calculations and I'm graphing the output with the delta on the vertical axis.

power twoproportions (0.344), ///
    k1(50) k2(10(10)90) m1(29) m2(29) power(0.8) ///
    graph(x(K2) y(delta) ///
    ylab(#6) xlab(#10, angle(45)))

Is it possible to convey the vertical axis as a percentage or share of the baseline take-up rate?