Web versions are your friend on ChromeOS: messenger.com, web.whatsapp.com, web.telegram.org all run fine in Chrome. If your Chromebook supports Android apps, Signal from the Play Store works well too.
Marking solved in my head, thanks all. – Noah Kim 2mo ago
Clear, concise, correct. Rare combo on the internet these days. – Maya Chen 2mo ago
Careful though, this also hides your own status, which you may not want. – Wren Weber 2mo ago
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Signal has a proper Chrome/desktop client that runs great on a Chromebook. For the others, just install the web version as an app from the Chrome menu and they behave like real apps.