If I understand you correctly not. You always need to trigger the z endstop for homing and that height can only be changed physically. If you have only one endstop that z offset should be 0. You can go up after hitting z endstop on homing with
#define ENDSTOP_Z_BACK_ON_HOME 5.0
but that is not the right way. Correct way is to physically level bed or endstop so that z min is triggered at z=0.
