After my cubox is not supported any more I ordered a Rock64Pro to use instead. I need TOSLINK to connect audio and looked around for a solution like for the audio board for the Rock64 that does not work on the Rock64Pro.
I found the this forum message with a description how to connect SPDIF/TOSLINK to pins on the Rock64Pro.
Did anybody try this, yet? Is there information whether audio routing with LibreELEC would work through such a connection?