For referencing fields belonging to [parentRow] (or [thisRow]) within a canvas cell within a template table, another simple solution is to simply write the formula as text (or you can write it in one of the “real” table (eg meeting table) then copy-paste the formula into the template table. Coda automatically recognizes the formula chips once the template makes it into the destination table.
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Of course the downside of this is if a column changes it’s name, the formula in the template will break. Plus the red underline feels wrong… but it’s a quick and easy hack.