Very important subject in it contribution to the "new" F1 efficiencies.
Pure pre-combustion chambers (flame ignition) are discussed here without any conjunctive fuel injection.
i think F1 rules limit the ignition source to one per cylinder which is unreasonable and an inhibition of good development, it should relate to the bore size and at 80mm two igniters would probably be an advantage.
but anyway the advantage in what can be called flame ignition is enormous.
the flame shooting out across the combustion chamber igniting a large tract of mix is such an advantage over a single point electrical spark.
One of the benefits from this large source area is the inhibition of knocking, a serious danger with such high compression pressures.
From the pre-combustion chambers i have seen, they only need room for a 3mm to 4mm hole to exit into the chamber proper.
The important dimensions are the ratio of the volume where the sparkplug point is to the volume of the barrel and then the barrel diameter, the larger the diameter the less distance the flame travels across the chamber.