Meta data export/import for manually selected assets

Right now, we can only export meta data on a folder level. This is impractical if you need to edit only meta data for 30 assets, but then wait hours for a folder meta data report because there are 5k assets in a folder. And no, smaller folder is not an option here. 
So what would be preferrable is that you simply select any assets you want and click “export metadata”. The upload of meta data should support this, so that you can add the meta data e.g. for the top folder and it will be applied to all assets in the csv, regardless of their sub folder location (not tested in current environment - maybe this works already?).