Obtaining app storage details via ADB

**TL;DR:** On-device, we can navigate to *Settings › Apps,* and for each app separately can call up details on storage used: by the app itself, by its data, by its cache. Is it possible to obtain those details from the command line, ideally via ADB – and ***without having root access?*** **In detail:** I've already searched the web, but found no information on this. I've already tried walking the package list (pm list packages), obtaining the path to the APK file (adb shell pm path $pkgname | awk -F':' '{print $2}'), and getting the file size of that (adb shell stat $path | grep Size) – but that has a series of disadvantages: * it only gives me the size of the APK (for updated system apps, only of the latest update) * even if scripted, it takes ~2s per app to obtain even that. As today's devices already ship with far more than 100 system apps, it would take "ages" even if only a few user apps were installed (almost 6 minutes on an almost virgin Wiko Sunny 3 where I just tried that) * details on data and cache are completely missing Ideally, Android has already somewhere collected those details; it doesn't take that long via the GUI. Maybe there's some database one could query ***without having root privileges*** – or some XML to parse, or some shell command I missed? **PS:** if you know about a root-only solution, that'd be "better than nothing". Please indicate that in a comment then so I can come back and ask you to make that an answer if there are no non-root solutions.