use a lookup that references the entire enrichment, not just a text value.
When using the "Lookup Single Row in Other Table" i don't think there is an option to specify the field type, it just spits out everything afiak
When setting up your lookup, select the option to "Insert all properties" from the enrichment column—this will preserve the full object structure, allowing you to access nested fields directly.
I don't see this option when using "Lookup Single Row in Other Table"