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do we need another if here, we can probably do { % set ns = {'firstPrinted': True} %}
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Unfortunately, we can't change variable in a loop in a straight way. You couldn't be able to notice that changes inside the loop itself.
You also can not simply call the function like {% ns.update({'firstPrinted': True}) %}. It leads to error and ports.json is empty as a result.
The main idea was that this function must be called to calculate that if condition. Unfortunately, I have not found another way to do it.