No, I wish it was. Exporting is made for transferring from machine to machine, or installation of OBS to installation of OBS. When you import a scene collection you've exported, it makes another scene collection with the same content. There's now way, currently, to move a single scene from one collection to another. The only way you could do it would be to manually edit the scene collection .json file.
If that was the single most complex element, it might be worth it to duplicate the scene collection that contains that scene, and then recreate the rest of the collection around it.