Disclaimer: I’m not an electrical safety expert and don’t have experience with active chamber heating. Anything you try is at your own risk.
According to the BTT Wiki, the M5P can only handle 5.5A on the E ports and 10A on the heat bed.
For 30A, you’ll need a different way to control it. You may be able to use relays (see Controlling a chamber heater through a relay connected to RPI4 via GPIO and monitored with a DS18B20), but you’ll have to make sure your relay model can handle 30A. Try at your own risk. 30A is a lot of current.
Also, just to be safe, you can add a temperature sensor to the heater itself, in addition to the ambient sensor, with a max_temp to reduce the risk of fires.