Edit number of objects in NvDsFrameMeta.

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I am trying to write a custom plugin based on the given gstdsexample. What I can’t wrap my head around is, how do I edit the number of objects inside NvDsFrameMeta.
One way I figured would be to free the previous meta and attach new meta with the desired number of objects, but that would mean discarding all the previous information.
inside,
bbparams = (NvDsFrameMeta *) dsmeta->meta_data;
I need to modify these two fields;
bbparams->num_rects;
bbparams->obj_params;
for the sake of simplicity assume num_rects is currently 2, I want to change it to 1 or 3 objects.