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Please add the to Smartcrawl Pro schema builder the ability pull taxonomy info from the termeta table since that is where the data should be stored and any well written plugin will be using wp_termeta instead of wp_postmeta for that purpose. You already have a selection drop-down in the schema builder.
It seems many plugins that use taxonomies for efficiency instead of storing everything in postmeta as may have been the case when Smartcrawl was designed. So being able to pull associated taxonomy data is necessary for Google Structured Data and other cases.