There seems to be no standard writing for this, just analog printing. I am a college student, and the teachers I have met usually write: C, O, Q with one on the left; R, n, b, h add a vertical line to the left of the appearance, such as |R, |N, |B, | h；; Z Add a/along/inside the lower edge. In the case of no ambiguity, some teachers write the corresponding letters directly, instead of |R, they write R directly. ...

I am ignorant, I hope I can help you!