Hey,
LingQ offers linking even several words in a row, but I can see there is a problem with lingqing (what it the right word for that?) only part of the word, for example “agradecer” from the “agradecerle” word in Spanish, or only part of the word in Chinese. Although it is in my vocabulary list it is not marked nor I can edit this from the text.
I think it is quite important to make those lingqs more flexible