This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
儞 combines the person radical 亻 with 爾, which likely contributes sound. The exact historical development is uncertain.
A person 亻 beside 爾, a complex shape that may suggest a pronoun or name. Without a clear meaning, picture a person whose identity is uncertain.
For ジ, imagine a person named G who stands beside the complex 爾 shape: G -> ジ, and the person's name is the reading.