We recommend using the Thunderstore Mod Manager or an alternative for installing mods
This mod will let you add nearly any object to the spawn menu! While the mod is active it will try to add any items you shoot. You can enable and disable the mod with BoneMenu (or EasyMenu) and change whether it starts active or not in modprefs.
When you shoot a valid object some text will appear over your right wrist for 2 seconds telling you the name of the object. After shooting some things, just load into any other scene and they'll be in your spawn menu under props.