については何も知りません

know nothing about

→ に
phrase Rare #26,386
know nothing about A polite, neutral expression meaning that the speaker has no knowledge of a particular topic. については highlights the topic as “as for” or “regarding.” The less polite version is については何も知らない.
JA: その問題については何も知りません。
EN: I know nothing about that problem.

トム過去については何も知りません

I don't know anything about Tom's past.

彼らの計画については何も知りませんと彼は言った

“I don't know anything about their plans,” he said.

彼女については何も知りません

I don't know anything about her.

彼の過去については何も知りません

I don't know anything about his past.

そのことについては何も知りません

I don't know anything about that.