This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
儨 is a rare character combining 亻 (person) with 質 (substance, quality). The exact historical development is uncertain, but it likely originally referred to a person of substance or a related concept.
A person 亻 of substance 質: imagine a solid, dependable individual, but the exact meaning is unclear.
For シツ, use the reading of the right-side component 質 (シツ): a person 亻 with the same sound as 質.