I doubt that it is possible with GLM.

I haven't played with GLM 5.3, only with 5.2, so I cannot say for sure.

GLM is at the level of Opus. Fable is something different entirely. It is capable of tracing the data flows of the app, I even tried it in a huge PHP codebase, it works.

PHP is a weird beast because it allows something like

    $v = 'SomeClass' + 'Controller'
    ... // and later
    new($v)

In other words, it could be hard to understand the code without running it, Fable reads this.

And another distinct feature of Fable — it is an amazing orchestrator. I prohibit it basically read and write, and it operates a swarm of haiku and sonnet.