german ww2 manuals as well as post war literature state the a2 version could carry 2 500kg bombs.
the airframe and internal wiring were designed with that in mind, often only 1 heavy bomb was carried if speed and maneuverability was needed, but if the mission required it 2 were used.
the a1 version (current ingame version) was not primiarily designed to carry bombs, but to be used as a fighter. although it still had 2 bomb ports. the plane structure itself needed reinforcement to be able to hold 2 500Kg bombs without issues, the planes overall power was strong enough for that even in the a1 version.
later in war many a1 frames were reinforced to carry heavy bomb loads of 1000 Kg bomb loads without issues, receiving a U behind their names for UmrĂĽst to designate modifications (A1-U or similar).
concludingly this means for enlisted that
the current exact me262 a1 plane should either not carry any bombs at all to be 100% technically precise (although not historically precise as infield the crews modified whatever was needed as long it was possible for specific missions) or
be flexible and assume the games a1 version is either an early war a1 or also possibly a later version thats modified, in which case it can carry a bombload of 1000kg. mechanically not 1 single bomb, but 2 500Kg bombs.
option 1 is obv nonsense, as the plane already is underpowered af, and staying with the current configuration of 1 heavy bomb doesnt help it either, as its significantly inferior to the meteor, which received fantasy spitire turn times.
regarding the little japanese kikka, which is just a smaller me262: mechanically its impossible to give it more bomb load, so just give it the magical turn rates of the meteor and give it more ammo. doesnt even matter if it was technically possible, as the low ammount of ammo is imcompatiable with game balance in enlisted.
/TED talk over/
Edit: the ingame versions could also easily carry 24 rockets…so there is no reason at all to not buff it.
not that adding a heavy bomb would help this aircraft since big bomb=more weight slowing it down.
Though it looks very stupid to have only one bomb on an airframe designed for two bombs so I would even accept 2 250kg bombs instead of 1 500 kg.
Since the turn rates of these jets are completely made up, I think it would make sense to give the Meteor a slightly slower turn rate which is more in line with the turn rates of other aircraft.
R4M has 620 grams and 24 of them. The ROS82 with 560 grams (closest equivalent) has an 14 meter frag radius; the R4M will have a slightly better radius and higher velocity. If you think it would be a good and balanced addition you are delusional.