Plasma Mobile deserves the same degree of integration with desktop PCs as we have with Android phones using KDE Connect.
The kdeconnect-kde repo contains a WIP implementation of a Kirigami frontend for KDE Connect. To build it the CMake flag EXPERIMENTALAPP_ENABLED must be set to true. It is basically functional but lacks some features that the Android implementation provides. Those must be ported to C++/Qt(Quick). This will also be beneficial for the desktop2desktop and non-Plasma KDE Connect experience. Note that KDE Connect is intended to work outside of Plasma, so Plasma-specific implementations should be avoided where possible.
For questions about KDE Connect ping @nicolasfella, @apol or @albertvaka or join the [[ https://t.me/joinchat/AOS6gA37orb2dZCLhqbZjg | Telegram channel ]].
For most of this you won't need to run Plasma Mobile. You can develop on any Linux distribution.
Some possible tasks are listed as subtasks to this task.
Knowledge requirement: Basic understanding of C++, willing to learn Qt/QML