Setting thumbnail within file's upload information

Would like to see a feature that when I export my video projects, I can set a custom thumbnail for the file that websites such as Vimeo, LinkedIn, Facebook, Youtube, etc., can see and use as part of the file's uploading process. Currently we have to create and upload an image file alongside the video file each time we post across platforms and they ask for a custom thumbnail. This feature will reduce a step in the platform uploading process, and allow anyone with the file who doesn't upload to sites via Premiere to always have the correct thumbnail to use for that video.