The android sdkmanager tool has a way to almost list the available packages, like so:
$ sdkmanager --list
system-images;a...ult;armeabi-v7a | 4 | ARM EABI v7a System Image
system-images;a...-10;default;x86 | 4 | Intel x86 Atom System Image
system-images;a...pis;armeabi-v7a | 5 | Google APIs ARM EABI v7a Syste...
system-images;a...google_apis;x86 | 5 | Google APIs Intel x86 Atom Sys...
system-images;a...ult;armeabi-v7a | 2 | ARM EABI v7a System Image
system-images;a...ult;armeabi-v7a | 4 | ARM EABI v7a System Image
system-images;a...15;default;mips | 1 | MIPS System Image
system-images;a...-15;default;x86 | 4 | Intel x86 Atom System Image
system-images;a...pis;armeabi-v7a | 5 | Google APIs ARM EABI v7a Syste...
system-images;a...google_apis;x86 | 5 | Google APIs Intel x86 Atom Sys...
system-images;a...ult;armeabi-v7a | 4 | ARM EABI v7a System Image
system-images;a...16;default;mips | 1 | MIPS System Image
system-images;a...-16;default;x86 | 5 | Intel x86 Atom System Image
system-images;a...pis;armeabi-v7a | 5 | Google APIs ARM EABI v7a Syste...
system-images;a...google_apis;x86 | 5 | Google APIs Intel x86 Atom Sys...
system-images;a...ult;armeabi-v7a | 5 | ARM EABI v7a System Image
system-images;a...17;default;mips | 1 | MIPS System Image
system-images;a...-17;default;x86 | 3 | Intel x86 Atom System Image
system-images;a...pis;armeabi-v7a | 5 | Google APIs ARM EABI v7a Syste...
system-images;a...google_apis;x86 | 5 | Google APIs Intel x86 Atom Sys...
system-images;a...ult;armeabi-v7a | 4 | ARM EABI v7a System Image
system-images;a...-18;default;x86 | 3 | Intel x86 Atom System Image
system-images;a...pis;armeabi-v7a | 5 | Google APIs ARM EABI v7a Syste...
system-images;a...google_apis;x86 | 5 | Google APIs Intel x86 Atom Sys...
I would like to understand how I can actually read the output so I can install one of those packages from the command line.