This feature would entail adding a table to languages that use declensions for nouns and adjectives such as Latin, Greek, Slavic languages, and German. This would likely be under the dictionary tab, and just show the stems of the word and the declension of it.
I could see users using this feature while learning classical languages such as Latin or Greek. Using Latin as an example, the word "vīta" is shown as just that, but it would be very helpful while learning to see the other stem, "vītae". Further, being able to see the declension chart when searching the word would make translations much easier. Another service that includes this feature is Cactus 2000 (https://latin.cactus2000.de/noun/shownoun_en.php?n=vita&form=vita). Thank you!