Best thing I found was the Autorig Pro addon, is a paid addon from blender, but it lets you export your model with the Unreal Skeleton bone configuration, so fully compatible with the marketplace animations.
You can also try building yourself the bone chain and naming correctly and rig it to the character, it should work, though if you wanna to do your own animations you’ll have to build controllers and stuff over it (now that I think of it there’s another paid blender addon that builds unreal skeleton inside of the rigify rig, but i don’t remember how it’s called, but google it and you should find it) , so not recommended if you’re not a rigger, also Blender bones work different than Maya bones (the ones used by the unreal skeleton) so it may not work, if by the end you decide to build and rig the chain yourself just remember to export only deform bones and uncheck add leaf bones.
But yeah those are the workarounds I’ve find to work with the Unreal Skeleton.