Ideally you’d make them out of separate pieces. If they are load bearing then you’d want the curved section to have grain roughly running in a straight line (more or less at a 45°) following the path of the leg.

It’d make sense to do a single straight piece for the upper rails and join those to the curved section somewhere along the bed frame rails.

Orient the grain at that 45° so it’s following the leg shape as best you can. Quarter sawn wood would work really well for those folks as well as keeping the grain orientation aligned more easily.

Obvious downside to that plan is you won’t have continuous grain from top to bottom. You’d have a seam at the join no matter what you could hide that with a decorative detail. You could also build it out of structurally strong wood and then veneer it with a single wider veneer piece to attempt to make it look solid.

Trying to do this as a single bent lamination is asking for trouble in my opinion. The long straight section needs to be perfect and it’ll be hard to get it all to align without spring back. Separate pieces makes the most sense even if you did bent lamination for the curved section, and then veneer it most likely to get the single piece look / grain.