APEX

I am trying to create two-level x axis chart in APEX. I want to achieve the same result in Apex as you can see in this excel example:

This is my table:

Source type is set to sql query in Apex:

For 2016 serie:  

 select PRODUCT ||' - '||CATEGORY , PRICE from TEST_PRODUCT where DATE_C = 2016 GROUP BY PRODUCT ||' - '||CATEGORY, PRICE;

For 2017 serie:    

select PRODUCT ||' - '||CATEGORY , PRICE from TEST_PRODUCT where DATE_C = 2017 GROUP BY PRODUCT ||' - '||CATEGORY, PRICE;

This is generated chart in Apex:

I want to achieve the same result as in excel. Is it possible to create Two-Level x axis chart in Apex? I use oracle 12c with Apex 5.1.3 .