Yes, you can connect the Lenovo L15 monitor to an iPhone 11, but it requires some additional adapters and steps.

Here are the necessary steps:
- You will need a Lightning to HDMI adapter from Apple to transfer the signal from your iPhone to the monitor.
- Since the HDMI port does not provide power, you will also need to use a USB-C to HDMI adapter that receives power via an external power block. This adapter should have HDMI input and USB-C output.
- Connect the Lightning to HDMI adapter to your iPhone and the HDMI cable to the USB-C to HDMI adapter.
- Make sure that the USB-C to HDMI adapter is connected to an external power block to ensure the necessary power supply.
- Connect the HDMI cable to the Lenovo L15 monitor and make sure that the monitor is set to the correct video source.

This configuration allows you to mirror the image of your iPhone to the Lenovo L15 monitor, but the audio output must be handled separately via Bluetooth or other means, as the connection via HDMI does not allow audio transmission from the iPhone to the monitor.