If you allow your client to leave a comment on your Photos, you can retrieve them directly on Lightroom as well.
There is only 2 steps for that :
Select one photo of the published collection under Evlaa Note : You need to select the collection under the publish service and then a photo of this collection.
Click on the Sync button under the Comments on the right column.
Note : We download the comments for all the photos of the collection and for all the clients. You just need to click on time on this button.
Et voilà the comments are linked to your Photos :-)