Keynote Math Four Quadrant Scatter Chart Settings

I used to have Microsoft PPT and would make charts in PPT using Excel where I could format them to have the x-axis and y-axis both bolded and the scales for each aligned next to those axes in the middle of the graph. This created a four quadrant graph like you would normally see on math quizzes, etc. In Keynote, I have figured out how to bold the major axes, but this results in the far right or far top axes also being bolded? I do not want that. Additionally, the axis scales are on the outside and not inside the graph. How can I make it look like a math graph for a middle or high school test?