Since KF6 we have "Copy" in the context menu of the main certificates table.

The "Copy" action is missing from the tables in the certificate details. Please add it.

Bonus for tool tip "Copy cell" because users might not expect, that only the currently selected cell is copied, not the whole row, which is visibly marked. The selected cell can hardly be seen. (Would then be nice to have that tool tip in the main certificate table, too.)