Maybe.
First the generator has to be able to run 100 amps worth of chargers
Next, the two or more chargers need to be near the same charger voltage so the spread between their voltages and the battery voltage is nearly the same so their amps will add. If one charger has way higher voltage, it will do all the charging at its rate in amps, and the others with lower voltages will still be "on" but doing nothing towards the amps to the battery total.
Now the next trick is if the inverter/charger is somehow powering the converter by way of its inverter while the generator is doing pass through for the 120v and the inverter/charger is "enabled" so it should be charging the batts. it is all about transfer switches either outside or inside (or both can exist) the inverter/charger.
I haven't got that straight in my mind yet as to how that would work. :)
But never mind that, ??? :( ??? , if you can get power to the converter and set it to nearly the same voltage as the charger in the inverter /charger and get both on the battery bank, then yes, they will add their amps.