want to change the label of variable set name in catalog form in SCTASK

[MK-955]

HI Team please help on new criteria,

In Request Item under one SCTASK form variable set label name should be change, Variable set name change in sctask form. please look in to below screen shot.

[MK-955]

I have used client scripts -onLoad scripts and i used below script

g_form.setLabelOf("variable name", "label name");

but its not worked, can you help on this scenario.