I am a little unsure exactly what you mean.
If I am correct; you are stating that an interactive identification scheme can be turned into a non-interactive signature scheme using the Fiat-Shamir Transformation?
If that is the case: I agree.
Further you ask if a sigma protocol be transformed into a signature of knowledge.
I am not sure what you ask for here. However, if you have successfully turned an interactive ID-scheme into a non-interactive signature scheme using the Fiat-Shamir transformation, you can obtain a non-interactive proof of knowledge.
I would encourage you to read more about the Fiat-Shamir Transformation and maybe check out the Feige–Fiat–Shamir ID scheme as well as the Fiat-Shamir with Aborts Transformation.