Is it possible to add metadata to a message?

I'm trying to identify responses that my bot gives as a result of one specific (/) command. I don't want to differentiate messages by checking their format. I tried looking for flags, embeds, even using nonce (really shady), but every attempt failed.

Attached are images of my code, I need to do something like this, but using some kind of metadata or any other parameter that allows me to get this "emoji" data.
image.png
image.png
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