问题 I'm trying to create a chart somewhat along the lines of the Multi-Line Tooltip example, but I'd like to format the string that is being printed to have some text added at the end. I'm trying to modify this part: # Draw text labels near the points, and highlight based on selection text = line.mark_text(align='left', dx=5, dy=-5).encode( text=alt.condition(nearest, 'y:Q', alt.value(' ')) ) Specifically, rather than 'y:Q' I want something along the lines of 'y:Q' + " suffix". I've tried doing