Is it possible to calculate the concentration percentage using chromatography paper?
Yes, it can be done. 

I have done it on silica plates to compare the content of a natural product in different samples of plants. 
It is , obviously, better to use HPLC, but in that case the sample preparation was very tedious so we decided to do it through TLC. 
The content in the different samples was between 0 and 2%. Standards equivalent to a content of 0.5, 1, 1.5 and 2% we're prepared. 

What you need to have succes is to be very accurate in the quantity that you apply on the plate and to have a good developer. 
The quantities applied must be all the same, preferably not too much because then the spots are very big and it is more difficult to compare them. 
Our product was developed with $\ce{KMnO4}$ yielding an intense yellow spot on a purple background.