I have recently started using Djay for Android on my Chromebook, and yes, this playlist creation ability would be helpful. For my kids’ learning how to DJ, it would be extremely helpful if they could pull songs from their Google Drive since the Chromebook has very limited internal storage. As you note, Google discontinued its Play Music service in favor of YouTube Music some months ago, at which point a lot of us decided it was better to just host our libraries in our own cloud space (plus hard drive backups ) to avoid this kind of shakeup in the future.
Also would be helpful to fix a few other little annoyances with the app for non-touchscreen Chromebook users. One that comes immediately to mind: The two-finger scroll using the trackpad doesn’t release when you lift your fingers from the pad, so you have to click or else every attempted movement of the pointer after you scroll through a list results in more scrolling. This might be fixed with an external mouse, but I don’t have one with which I can test at the moment.
Another thing would be expanding the hardware that can work with the Android app. I had an opportunity to snag a Pioneer DDJ-SB3 – slightly old-school but a few more features than the newer DDJ-200 – but Djay for Android doesn’t recognize it because it can only look for a Bluetooth device, not a USB OTG midi device.
I’m new here, so in the spirit of keeping things brief and friendly THANK YOU for giving Android and Chrome OS users this great program! My kids are enjoying their journey into learning the craft of DJing thanks to this very accessible option. I bought the premium version of the app because I want to support this kind of work.