BTW, your approach should work if you use a Pro Lookup field instead of a dynamic field. Lookup fields store text values. Dynamic values store the entry id. Dynamic fields are most useful for displaying your data in views since you can show any field in the lookup record.
In fact, when it comes to CPTs, I no longer store data for them anywhere other than Formidable. I build my associated WordPress CPT templates with Formidable Views. If Formidable is the source data system, under the "single source of truth" data philosophy, why would I display it with anything other than a Formidable View?
To build a Formidable driven CPT template, follow along with this article: https://formidable-masterminds.com/formidable-visual-views-and-cpt-templates/. The PHP is simple.
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