Node-red-node-ui-list ... with "unselectable" entries?

Hi there,
I'm using the node-red-node-ui-list for selecting / grouping my SONOS player.
Though I'm not using the players all the time I shut them down by smart plugs and they are only availible if I start them first.
Now I would like to have a list where all the players are availible, but only those which are currently online should be selectable.
I couldn't find an example so far. I found that you can set the list entries as " isChecked", but as "Checkable"
Of course it is possible to build the list without the inactive players .... but I prefer to do it the way discribed above.
Would be gret to get some hints or to push some improvements :wink:

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