This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
儣 combines 亻 (person) with 廣, which likely contributes the sound. The exact historical development is uncertain.
A person 亻 beside 廣, a shape associated with broadness. Without a clear meaning, picture a person standing in a wide, empty space, but remember the meaning is uncertain.
For コウ, imagine a person 亻 calling out 'Kou!' in a vast, empty hall 廣: Kou -> コウ.