How use Blenders installed before Blender Launcher

[karakufire]

I want to launch Blenders system-installed before using Blender Launcher via Blender Launcher without modfying installation settings. I thought Blender Launcher can register installed Blender individually by selecting their location, but I'm puzzled that it doesn't seem to be there. If there is not the feature, I request Blender Launcher the feature registering installed blender individually. Thank you for considering.