Good morning SKP,
I have not the information for all Shopping malls around town, but I checked already price for a booth at Dagon Center 2.
So if you want to rent a 10 square meters booth (around 90 square feet I think), it is roughly 200 USD or 200000 Kyats a month. After, it depends the size of shop that you want to have but if you want to sell shoes or bags, I believe you might need more than that, but that can give you a general idea.
If you are looking to rent a space in Junction Square though, I think price would more expensive since it is the most popular mall in town. My guess would be around double price, so 400 USD per 10 square meters I think.
However, you have to consider that the shops renting in these malls have at least a one year contract with the mall owners and if there is not available space for you in a mall, you will have to wait that a space become available. I am not sure that offering higher price for the same space works, depends on the Mall company's rules.
If you want to know exactly, just go to Junction Square and ask the management, they can give you all information you need I believe.
Last but not least, I think that I cannot tell you whether you will be profitable or not, you have to calculate all the costs involved in your business and make forecast on your sales, only then you will be able to see your business forecasted profitability.
But anyway, any shop can be profitable I think, as long as you are good at doing it, providing good service, having good products and managing well your shop would lead you to profits for sure, you just have to do it right and believe in your project .
Cheers and good luck in your shop project.