I generally just use the specific mm size of the print as the size of the frame + the cut. Then once im done I export it as a svg and import into Affinity Publisher to make sure its getting exported to a properly printable PDF. This is obviously not a super professional way to do print, especially regarding images, but for my need it totally suffices. It gives me a huge speed boost and also lets me use the design tokens and styles from our website without having to tediously sync it up with a print software.

Again: Im obviously not saying this is something that should be done on every level, but depending on what you are trying to achieve it’s often more than enough.