I think that are new functions from Ignition 8.3.
Did you miss the bit about the Automation Professionals Integration Toolkit being a module you need to install to get this functionality?
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Expression language additions for 8.3 have not been announced.
Phil would not answer questions about 8.1 software with 8.3 solutions.
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Indeed. You just need to install my (free) Integration Toolkit module.
You can expect it to work in the future v8.3, too.