This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
皧 combines 白 (white) with 愛 (love), but the exact historical development and original meaning are uncertain.
The left side is white 白 and the right side is love 愛. Picture a pure white love, but its exact meaning remains unclear.
For アイ, imagine a pure white love that is the eye (アイ) of the beholder: eye -> アイ, and the white love is seen clearly.