Save reading positon across "devices"

I want to save my reading position in the Calibre Viewer across devices. I think the tool is mature enough to act as a reader in PC instead of other alternatives, like Fiction Book Reader (that syncs across devices but is very dirty in the task of respect the ebook format).

Currently I have my Calibre collection in a Dropbox folder (I know the dangers of that, I’m very carefully with the synchronization).

I expected that if I save the reading position, it will be available in other devices, but seems no.

Is it possible what I want?

Perhaps a Feature Request if not?

Thank, guys, in advance.