I enjoyed <somewhat> of opulence.

[park sang joon]

The protagonist have amnesia. Flora is one of the protagonist's sisters.

I wondered at the source of Flora's obvious wealth. If we were related, did that mean that perhaps I enjoyed somewhat of opulence, also? I thought about my economic and social status, my profession, my origins.
<Nine Princes in Amber" of The Great Book of Amber by Roger Zelazny>
I'd like to know if "somewhat" makes the role of a pronoun in "I enjoyed somewhat of opulence."
Thank you in advance for your help.

 

[Cagey]

This is somewhat used as a noun with this meaning:

some part, portion, amount, etc.

WordReference Random House Unabridged Dictionary of American English © 2015​

It is not a common use these days. It appears that the author is imitating an old-fashioned manner of speach.

 

[park sang joon]

Thank you, Cagey, for your so helpful answer.