As an update:
In version 2.6.2 there are now "switches" available as data layer nodes to chooses the behavior:
As the default settings changed, you must set the following data layer variables path: plc/admin/runtime-settings/symbol-settings and save change afterwards by executing plc/admin/cfg/save.
{
"enumRepresentation": "BASETYPE",
"arrayDisplayName": "OFF"
}
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