It would be a great QoL enhancement to have the ability to export straight from the timeline.
Here is how I see it could work.
Select layer and frame/frames to be exported.
Right click on the selected and in the context menu choose Export As… or Export
Only the things you have selected will be exported in the last format you used to the last known path you used before.
The file name will be the name of the layer. The frames exported will be the frames you have selected. If multiple layers are selected both layers will be exported as separate files.
If you choose Export As… you define the path where the exported assets will end up. If you choose Export it will export to the path you used before on that layer and overwrite the file.
This would be a good time saver if you export layers and frames to be used in other tools and making updates not needing to go through the Export dialog at all.