I can confirm the lack of commands in transcripts in Fabularium.
Unfortunately most of the interactive fiction interpreters on Android don’t seem to have updated in a few years. There’s Text Fiction (also not updated for a few years), but it doesn’t do glulx.
There’s ‘incant’, which I don’t think is in the Google Play store or F-Droid, but has apks on GitHub: GitHub - WakeRealityDev/incant: Incant is an experimental interface to a Glulx interpreter and a Z-Machine interpreter for Android
I recall playing with it but deciding Fabularium was better (I don’t remember the reasons now).
Another possibility is installing
glulxe in Termux. [In brief, install Termux from F-Droid or Google Play, open Termux, type
pkg install glulxe and then
glulxe <path/filename of the .gblorg>.]