I think there is no direct solution for that question. However, you might consider connecting your OpenHAB system via bluetooth to Echo and use it as bluetooth speaker, so you can play the sound on your computer.
Though I would be happy if there’s a direct solution, especially if that included, e.g., playing musing from a NAS like Synology.
thanks for the fast answer, connecting openhab and alexa via bluetooth is not an option.
The openhab system is up in the attic, away from everyhing. Not possible to connect to it through wifi or bluetooth.