Hi, KQuickChatComponents (https://invent.kde.org/libraries/kquickchatcomponents) is in kdereview now.
It is a very small (as of now) library mostly containing a base bubble component offering a consistent bubble design, with a few variants built on top of the bubble offering common patterns of chat things with bubble backgrounds and layouts. Besides the timestamp component, that's pretty much it, since chat apps need to diverge heavily to accomodate their protocols. This library's purpose is mostly for getting KDE's plethora of QtQuick chat apps to converge on one (1) bubble design instead of a different look per app, as well as other details like the selection of shortcuts used for common chat app actions (see MR !2) -- Janet