Hi. You can see how it was made in FPathContextMenu::ExecuteFixUpRedirectorsInFolder()
There is a special function to fixup redirectors there, but you have to collect all redirectors you want to fix first
// Load the asset tools module
FAssetToolsModule& AssetToolsModule = FModuleManager::LoadModuleChecked<FAssetToolsModule>(TEXT("AssetTools"));
AssetToolsModule.Get().FixupReferencers(Redirectors);