Some other iMX devices (see https://doc.qt.io/QtForDeviceCreation/qtdc-supported-platforms.html ) are already supported. Thanks, marion
The link in my original question has a list of reference devices currently supported. I would like to see iMX8M EVK added to this list. Qt for device creation has a very nice an easy to use API for some very device specific features like WiFi. Guess I'll just have to do it the old-fashioned way.
Please download the Yocto BSP documentation Linux L4.14.78_1.0.0 Documentation
Please read the i.MX_Yocto_Project_User's_Guide.pdf.
You can follow the steps from the document to build the QT5 image.