Is it possible to have 3 UV channels?

Hello! In a model I’m using 2 UV channels for my texture work, but I’d need a third for Lightmapping. If I try to generate UV for lightmapping on the model, it screws my second UV channel, the one used for my stuff, so is it possible to have a third for lightmapping or there’s a hard limit of two?

Unity doesn’t have support for more than 2 UV channels.