Yes.
1. According to the current official website, iPad Air 4 can support the original Apple Pencil II. Of course, because its price is relatively expensive, many people choose to buy other third-party pens for writing.
2. It is very cheap compared to third-party replacement pens and can also be used for writing. The only disadvantage is that it does not support gravity pressure sensitivity, so it is still very good for taking notes, but it is not suitable for drawing.