Can i make bones on unreal engine without using Blender or something like that?

because i need bones for my character and animation.
But can i make them with unreal ?

You can use Mixamo - It will rigg your character and you can also download free animations.

no i mean only unreal engine


I think that maybe the closest you can have is to use a plugin called “Allright rig” very good plugin i’d say Animation Rig For Unreal Engine #AllrightRig 2.0 - YouTube

Ok thank you guys