How to make a non-parent bone follow another bone in a physics simulation?

Hi! I hope I have chosen the right category
I’m trying to do physics on a loop of rope. I make a mesh and a skeleton in a blender, physics in ue5.
The skeleton looks like this (green line 1 is the main parent-line of bones (_L), blue line 2 is the second parent-line (_R). Line 2 converges with line 1 on the Rope_04 bone (which parent bone is Rope_03_L).



In ue after creating a physics asset, the Bone_03_R bone does not follow Bone_04. How can I make the rope loop simulate correctly and Bone_04 bone affect Bone_03_R as well?



P.S. I also tried to make IK constraint for bone in a blender, but it only worked in a blender and I couldn’t transfer it to ue.