For others who might be looking for this.
Another approach is to create an actor blueprint, call it Notes or anything else you like.
Put in notes (hotkey c) and start typing your text.
This is another approach than the one by @Everynone, whos suggestion was an Excel-like solution if one prefers it.
As for the data-table approach; If you don’t want to drag-drop a CSV file, you have to create a Data Table yourself in UE:
Add New > Misc > Data Table. Then pick the Row Structure created as instructed by @Everynone