How to implement field based access as mentioned in the docs?

[normic]

Great package 🥇 Much clearer adn more flexible than the DRF build in permission system.

I appreciate the feature Field Level Permissions but can't get it to work fully.

From the docs: Often, depending on the user, not all fields should be visible or only a subset should be writable.

The docs example shows how to remove a field at all, but I can't figure out how to achieve making one or more fields read_only. Even lurking at the source does not help me figure it out.

Would it be possible to explain that a little more or giving a hint how to achieve "only a subset should be writable"?

Thanks.