It is not possible increase the power of 1 SS block of SSB burst directly using nrWavegenSSBurstConfig, nrDLCarrierConfig, and nrWaveformGenerator.
Also, I feel you are pointing to hSIB1Boost rather than hSIB1WaveformConfiguration. Since, hSIB1WaveformConfiguration file only provides the waveform configuration.
The Power property of nrWavegenSSBurstConfig, applies same power for all instances. For different powers for each instance, you can use hSIB1Boost file with slight modifications.