Legend for expression on Bubble Chart/Grid Chart

[#1]

I am having hard time figuring out way to lable the bubbles of Grid Chart. Attached pic will make it more clear. I have a grid chart with two dimentions (margin and date) and one expression revenue. Bubble size represents the revenue size but i am not able to find out way to lable these bubbles as project name. Any ideas? I will appreciate every help. Thank you!

[#2]

try something like this:

dual(Capitalize([Project Name]) & ' : ' & num(Sum(Revenue), '$#,##0.00'), Sum(Revenue))

[#3]

Thanks for reply but unfortunately it did not work. same chart showing up with no legends. Can you create an example and attach, I would really appreciate it.