Can you explain your query through a block diagram?
There is no way to trigger the host from the device. If you even use interrupt endpoint, the host needs to poll the interrupt endpoint.
Please refer the USB Spec - Interrupt endpoint. (Or this link: https://www.beyondlogic.org/usbnutshell/usb4.shtml#Interrupt )
For example in USB 2.0: The host must send the IN Tokens over the interrupt or bulk endpoint, then only the device can respond to it with either DATA Packet / ACK/ NACK/ STALL.