My question: is it true that we can define a spectrum of $\mathbb{C}$-algebra $A$ in such a way that it becomes a complex manifold with the algebra of holomorphic functions $A$? Maybe it will work if we restrict to algebras that already are an algebra of holomorphic functions for some manifold?

I'm aware of the construction of Gelfand spectrum but it gives us only continuous functions on the spectrum and not holomorphic functions...

It is a cross-post from math.exchange https://math.stackexchange.com/questions/3510203/holomorphic-spectrum