Is there a way to see which 音読み is being shown?

[polv]

External Definition script pulls data from Weblio (and Kanjipedia) to be shown in WaniKani.

[Userscript] WaniKani JJ External Definition from Weblio (JP) and Kanjipedia

On various WaniKani pages, the script displays J->J definitions of Kanji from Kanjipedia and of vocab words from Weblio. Weblio results with suitable reading and Part-of-Speech are shown first. In addition, various radicals can be deemed Kanji, as well as some Kanji aren’t in Kanjipedia, so fixed accordingly. (Weblio aggregates from various sources including Wiktionary and Wikipedia.) If you have an old version of the script (version 0.10 or below) please upgrade to the new version. [Change No…

Otherwise, the info can also be found in en.wiktionary.org