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can `ros2 topic list` poll periodically?

Maybe I imagined this - but was there once a way to run ros2 topic list and not have it exit immediately, but rather poll periodically and list all topics that it eventually sees?

I can't find any reference to this in the git history - but I also can't believe I completely imagined this feature.

I'm interested in having ros2 topic list monitor some other processes that get launched, and then check the list of all topics that were seen - even ones that appeared later, or went away at some point.