There isa plugin to configure json/ld schema data into the HEADER element of ZC web pages. This functions irrespective of other components and as it is json/ld, it parses relevant data in the manner preferred by SE's. I think it's called SUPERDATA and it also configures Opengraph elements for Facebook ---- (Though it appears Facebook is on it's last legs and may go bust before Christmas).
EDIT: Torvista's Structured Data Plugin is "Zen Cart Structured Data"


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