UPROPERTY(EditAnywhere, BlueprintReadWrite, meta = (RequiredAssetDataTags = "RowStructure=/Script/Emzara.DialogueRow"))
UDataTable* conversationTable;
In this case, Emzara is the name of my project, and FDialogueRow is the struct I wanted to limit the datatable selection to. Note that you need to remove the F prefix for this to work.