You can write to “learn”. Here are two interesting examples:
The brain is no place for serious thinking. If you’re thinking about something important and complicated, write it down.
Writing helps you to take better notes.
Richard Feynman once had a visitor in his office, a historian who wanted to interview him. When he spotted Feynman’s notebooks, he said how delighted he was to see such “wonderful records of Feynman’s thinking.” “No, no!” Feynman protested. “They aren’t a record of my thinking process. They are my thinking process. I actually did the work on the paper.
Sönke Ahrens — How to Take Smart Notes
Write clearly. Think better. It is a virtuous cycle.