Example file for making a FName row selector based on a fixed data table asset.

DataTableSelectorSettings.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "Engine/DataTable.h"
#include "UObject/Object.h"
#include "DataTableSelectorSettings.generated.h"

// DON'T FORGET TO DO THIS: !!!!!!!!!
// You will need to add "DeveloperSettings" to YourModuleName.Build.cs 's "PublicDependencyModuleNames" array.

// You probably don't need the SILO_API, but if you do it should be YOURMODULENAMENOSPACES_API also feel free to remove it
// from all of the following classes and structs.

USTRUCT(BlueprintType)
struct SILO_API FTestDataTableType : public FTableRowBase
{
	GENERATED_BODY()

	UPROPERTY(EditAnywhere)
	FName TestValue;
};

/**
 * 
 */
UCLASS(Config=Engine)
class SILO_API UDataTableSelectorSettings : public UDeveloperSettings
{
	GENERATED_BODY()
public:

	UPROPERTY(Config, EditAnywhere, BlueprintReadOnly, Category=DataTableSelectorSettings, meta=(RowType="TestDataTableType"))
	TSoftObjectPtr<UDataTable> DataTableAsset;

	UFUNCTION()
	static TArray<FName> GetDataTableRowNames()
	{
		if(!GetDefault<UDataTableSelectorSettings>()->DataTableAsset.LoadSynchronous())
		{
			return TArray<FName>();
		}
		
		// OPTION 1:
		// Get just the Row Name. Comment this line out if you want to use Option and remove the /**/ comments
		// on option 2.
		return GetDefault<UDataTableSelectorSettings>()->DataTableAsset.Get()->GetRowNames();

		/*
		// OPTION 2:
		// Get a value from the Row instead of using the row name, not guaranteed to be unique.
		static const FString ContextString(TEXT("UDataTableSelectorSettings::GetDataTableRowNames"));
		TArray<FTestDataTableType*> AllRows;
		GetDefault<UDataTableSelectorSettings>()->DataTableAsset.Get()->GetAllRows<FTestDataTableType>(ContextString, AllRows);
		TArray<FName> RowNames;
		Algo::Transform(AllRows, RowNames, [](FTestDataTableType* Item)
		{
			// Return here whatever you want from the row,
			// note: this will show two different items in the list if they have the same values,
			// but it won't differentiate nor store an index. so be careful. you won't be able to restore which one the
			// user actually selected when you go to use it.
			return Item->TestValue;
		});
		return RowNames;
		*/
	}
};


/**
 * 
 */
UCLASS()
class SILO_API ADataTableSelectorTestActor : public AActor
{
	GENERATED_BODY()
public:

	//The Silo in the below should be replaced with your module's name. The DataTableSelectorSettings is whatever you name the developer settings class above
	//without the U prefix. The GetDataTableRowNames is the static function above.
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=DataTableSelector, meta=(GetOptions="Silo.DataTableSelectorSettings.GetDataTableRowNames"))
	FName TestRowName;
};