What UI field populates stop_notes on the manifests/stops v1 api endpoint?

Hello!

Trying to run down the exact cause of an issue we're having with the api integration, and I needed to recreate (I thought) the stop_notes field on the v1 get stops by manifest id endpoint, but I'm not seeing that field populate based on adding notes to the stops in the web UI.
Can you point me in the right direction on the UI, or let me know which endpoint we might be getting those notes from, as we are gathering details from several different manifest and order api endpoints when we build our data.
thank you!