This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 羪 is uncertain. It visually combines 羊 (sheep) and 良 (good), but the original semantic or phonetic role of these components is unclear.
Since the meaning is unclear, picture a sheep (羊) standing beside something good (良) — perhaps a well-fed sheep, but the true meaning remains a mystery.
For ヨウ, imagine a sheep (羊) saying 'yo!' to a good (良) friend: 'yo' -> ヨウ.