So at a minimum, ~50W to supply 45W (which is only enough for a MBAir and not enough for a Pro). Macbook Pro Charger features a Built-in heat sink dissipates heat to keep the charger from overheating and macBook pro laptop charger runs safe and cold during the entire charging cycle. This Apple MagSafe 2 power adapter also powers the MacBook Pro when its operating without a battery. An LED located at the head of the connector turns amber when charging and green when the laptop is fully charged., and the magnetic DC connector helps prevent the cables from wearing out over time. There does not seem to be a USB-C PD → MagSafe2 option, possibly because it would require a charger that supports enough wattage to both power the MacBook (45W/65W/80W) and the dongle itself. Power or charge a MacBook Pro by using this 85-watt power adapter. Any USB-C → MagSafe2 dongle would essentially ensure the wattage via USB is available and emulate the correct MagSafe2 charger ID. It won't draw more current than the charger will allow because it knows which charger is plugged in.
The MacBook knows what the max wattage for the charger is by getting the id of the charger from the MagSafe2 plug itself. There are only 3 wattages for MagSafe2 chargers and they have well known voltage / currents. As people have noted, there are plenty of MagSafe2 → USB-C PD options. Electrically, it is possible to go from either direction, it just requires a computer (microprocessor, etc) in between to do the USB-C PD negotiation.
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