The Denel G7 LEO is a good example of a relevant 105mm gun. It has the range and terminal performance of a 155mm gun, but it's much lighter at 3,800 kg. At less than 5,000 kg (i.e. the Mi-17's payload), one can ferry the gun and its ammunition.
@Arsalan Theoretically, it may be possible to fit guided sub-munitions to an artillery shell. Rheinmetall already does it with the SMArt-155:
Standing for Sensor-fused Munition for Artillery, Calibre 155mm, SMArt 155 is a robust, highly effective "fire and forget" artillery shell. Each round carries a payload consisting of two autonomous, intelligent, high-performance submunitions. These are capable of neutralizing stationary and moving armoured vehicles of all types, including main battle tanks, in any environment and in all weathers. SMArt 155 makes it possible to halt an armoured assault with minimum ammunition expenditure and pinpoint accuracy, even at long ranges of engagement. The risk of collateral damage is reduced to a minimum.
https://www.rheinmetall-defence.com/en/rheinmetall_defence/public_relations/news/detail_1433.php