MyWords storing dictionary form

I am learning a foreign language and use my Kobo to read foreign books. A good dictionary and 'save MyWords' feature is therefore really important. I love the MyWords feature. But when I save a MyWord, it saves the conjugated / declined form as seen in the text, instead of the dictionary entry/lemma. Thus if I find this unkown word:

- bikes

and save that one, and next I come upon this word:

- bike

it would not recognize that I already did a lookup for that word (dictionary entry). Is it possible to make it so that it stores the dictionary entry, instead of the word as seen in the text?