There are readily available solutions
One problem with strata titled, body corporate undercroft parking type places is that sometimes the electricity metering is in one location and the consumers are spread across other parts of the building or property. For example it can be impossible to connect a sub circuit from a third story apartment to a basement car park. These location problems are shared by car charging and solar generation technologies but they're not insurmountable.
Upgrades might be useful but not essential
Car charging can use a significant amount of energy. In terms of instantaneous electrical load your 7kW EV charger may be similar to running your stove with all the hotplates on a rolling boil, or two standard electric hot water services, or three kettles.
In terms of diversity, there isn't much. Your kettle might take a few minutes before it clicks off but car charging takes hours, so not only is there a lot of kilowatts in peak electrical current involved, there are a lot of kilowatt hours in terms of energy.
Similar to solar systems that drive voltage up when it's sunny, and need to be controlled to prevent the energy grid being stressed, car charging will drive voltage down with load and they also need to controlled or co-ordinated. Happily they play well together in the same building.
What you need is a car charging system that has a few smarts
Not a standard Tesla one. (they rely on smarts in the car) Depending on what you choose or what is deemed appropriate by the BC, you can have wall mounted charge points that have tethered or I would think BYO leads would be better. The chargers themselves can be hooked up to the communal switchboard without needing to be run via individual living unit meters. Using an RFID card or phone app you can activate the charger and have the energy apportioned to your bill.
When physically running the new circuit there needs to be thought put into how many chargers will be installed in total, but the maximum demand for the whole installation can be handled by the charging system itself. Basically it will be commissioned so that it can't overload the supply to the premises. There is dynamic control so that whatever energy isn't being used by the normal loads in the building, will be spread to charging however many cars are present. If you have solar that will help, if it's night time then the cars(s) may be charged slower.
On top of that there could also be a requirement from the local DNSP (the poles and wires people) to have what they call DRM control. This is a fairly new space but for instance, SAPN are running a trial in 2023 where they pay you 30cents per day to take control of your car charger. It means they might throttle it down on those stinking hot afternoons when everyone's air conditioning is hammering the network, but it will also mean that you could have greater than normal capacity on low demand days. (In the future chargers will be bi-directional, so you can actually pick up energy for cheap when parked at work around midday, then bring it back to siphon off at home, lowering your bill when the grid is stressed and prices are excessive in the evening)
If you're in Queensland there may be requirements to limit car charging, either to 4.6kW for anytime availability or if you need a full 7kW it may only be available on off peak controlled circuits.
As for the actual hardware, there are a few links here that will get you started :