as a side note
01
余談ですが, ちなみに
used to introduce additional information or a comment that is related to the main topic but not essential to it
Collocation
例
As a side note, I wanted to mention that there will be a staff meeting tomorrow morning.
余談ですが、明日の朝にスタッフミーティングがあることをお伝えしたかったです。
