Add-on Multiple selection nodes for a widget


This is my case:

1 - I have a widget
2 - location: under messages
3 - forum with a lot of nodes

This widget is visible throughout the forum. I need it to be visible only in some nodes. As suggested by Brogan using into display condition field this code

in_array($xf.reply.containerKey, ['node-1','node-2'])

I can display this widget in desired nodes.

My request: I have a forum with many nodes. I need, if possible, a multi-select dropdown that allows for a quick selection of the nodes where the widget will appear.
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