Essential oil from the lemon juice is difficult to believe. The juice is mostly citric acid which is indeed aromatic but which is not an essential oil.
The quantity of essential oil in the lemon juice is indeed so small that the result from an extraction would be extremely costly, if it was only possible to distillate lemon juice.
Everything can be, but this does not make sense to me.

AbdesSalaam Attar
Compositore Profumiere