Indeed.
A table with a row for each day, 3 columns: Day name, start time, end time.
Maybe a button to commit changes back to Node-RED.
Though actually later takes inputs in text format so you could start simply by having a single input field in which you directly type the schedule and send it back to Node-RED. That would get you started and you could restructure it later if you really wanted a more structured UI.
If I get time, I might have a play with that as it might be useful to my home automation system.