Thank you!
Hm.
I don't know anything about syncing the position of reading at the moment but isn't it only a very little piece of data?
Moon Reader stores it on Google Drive so I need to read it from there and put it into the ePub file of Calibre that is what I primitively think but I guess I am wrong.
I would need an add-on which does this for me but I do not know anything about calibre add-on neither
Could that be possible?