Arduino CAN Interrupts

I am currently trying to write a program on my Uno R4 Wifi that uses the integrated CAN module.

I have an external transceiver, that is hooked up to 3.3V, ground, then CAN Rx and Tx to digital pins 5 and 8, according to Arduino R4 Wifi data sheet. I would like to have an interrupt triggered every time there is a new CAN message received. I know that something will have to be hooked up to digital pins 2 or 3 to use a hardware interrupt but I don't know what exactly would be setting the interrupt flag bit. Polling for this application would not be ideal but I'm not sure if I am able to use interrupts.
Any help would be greatly appreciated, thank you!