I’ll be honest, unless your idea can be patented successfully and be able to enforce that patent its not easy. Everybody and there brother has an idea for another furniture piece. Doubt youll be able to find any company interested in your designs. Not that they might not have merit, but what is the incentive of a furniture company to pay an outside person to do what their internal team can already do? Add to that that they know the manufacturing, supply chain and general operations better.
Better option would be to design the furniture yourself then hire a local maker to build it. Unless you have your own space. Bear in mind there are hundreds if not thousands of people trying to do the exact same thing. Dont mean to sound harsh, but just the reality