Nope. You have to have a helicopter certified for multi pilot operations and the operation must require 2 pilots. You don't fulfil the first requirement as CFII.
Definitions as per EASA Part FCL:
‘Multi-pilot operation’:
for helicopters, it means an operation requiring at least 2 pilots using multi-crew cooperation on multi-pilot helicopters.
‘Multi-pilot aircraft’:
for helicopters, airships and powered-lift aircraft, it means the type of aircraft which is required to be operated with a co-pilot as specified in the flight manual or by the air operator certificate or equivalent document.