Microsoft 365 Copilot is not available for KDE Plasma but there is one alternative with similar functionality. The best open source KDE Plasma alternative is Calligra Suite. If that doesn't work for you, our users have ranked more than 50 alternatives to Microsoft 365 Copilot, but unfortunately only one of them is open source and available for KDE Plasma. If you can't find an alternative you can try to remove all filters.
Calligra Suite is an office and graphic art suite by KDE. It contains applications for word processing, spreadsheets, presentation, vector graphics, and editing databases.
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Calligra Suite's interface kinda resembles iWork (is it still called that?), which would come as a shock to those coming from Office. Unfortunately, I didn't have a stable experience using it on my device running Zorin OS. It also lacks collaborative features.