How to create / append bulk tooltips via script with json export?

You can do it with jq (a downloadable command-line executable designed to manipulate JSON):
walk( if type == "object" and .valueSource == "opc" then .tooltip = "TagName: \(.name) \(.opcItemPath)" else . end)
https://jqplay.org/s/Pe6T7qNEFY

I mostly copied this snippet from here:

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