If there is, it would be a good way to heat the fuel.
And location within the chamber. My understanding of the prechamber is that the spark plug is within it. But the video suggests there's a potential 40mm gap between a side-located injector and the central spark plug. Perhaps Merc don't use this and only rely on jet design/sequence and spark.
It could also be that this is simply where the fuel lines enter. The injector, it's springs/needle/solenoid could still be central, paired with the spark plug, with a side entry fuel line. If fuel heating is beneficial, routing fuel through a channel near/within the exhaust port web could do this.