Physics wise the swing has no bend, so you don’t necessarily need the cable component. You should be able to just link the chain up as a spline point and have it react appropriately.
If you only need this to be a visual effect, why are you wanting to leverage physics? It makes little to no sense.
sense.
a material and vector paint to define the strength of the vector offset would be a better/quicker solution.
If you need this for your portfolio and not a game asset.
add a skeleton to it. Make a skeletal mesh. Set up the phat asset and you are good to go. Much faster/better looking than both other options.
you can also animate it in blender and plug the animation into unreal for rendering, which may possibly serve you much better.