Think about what constitutes "second segment." I can see where you're coming from...gear retraction until clear of obstacles. In some cases, you might have to look at a second segment profile until climbing out of the surrounding terrain, in others, you can use a different profile (eg, higher speed, etc) and still have adequate performance.
There are several ways you can derive that information, but you can always determine your rate of climb on both one and two engines for your weight and environmental conditions, then convert it to climb gradient on the jepp scale or NACO chart in each volume. Jepp doesn't put theirs in each volume, but it's in your first binder.