query: SELECT (wd:Q2481549 as ?item) ("people born in current Czech Republic" as ?legend) (GROUP_CONCAT(?p;separator = ",") as ?labels) (GROUP_CONCAT(?ct;separator = ",") as ?values)
  {
  	{
  		SELECT  ?p (COUNT(DISTINCT ?mainsubject) as ?ct)
  		{
  			?entry 	wdt:P31 wd:Q19389637
    			; 		wdt:P1433 wd:Q665807 .
            	?entry wdt:P921 ?mainsubject .
            	?mainsubject wdt:P31 wd:Q5 ; wdt:P19 ?pob . ?pob wdt:P17 wd:Q213 .
            	OPTIONAL { ?dob schema:about ?mainsubject ; schema:isPartOf <https://cs.wikipedia.org/>  }
            	OPTIONAL { ?dod schema:about ?mainsubject ; schema:isPartOf <https://de.wikipedia.org/>  }
  		BIND(CONCAT(IF(!BOUND(?dob),"---","cswiki-"),IF(!BOUND(?dod),"---","-dewiki")) as ?p)
  		}
  		GROUP BY  ?p
  		ORDER BY ASC(?p)                  
  	}
  }