How to get the population of a city in Wikidata?

Question

Wiki engines

It is necessary to send the name of the city and its region via the API and in response receive the population taking into account the region. I can't figure out how else to add a region query to sparql looks like this so far
SELECT ?item ?city ?region ?population WHERE {
?item wdt:P17 wd:Q159;
wdt:P1082 ?population;
rdfs:label ?city.
FILTER(LANGMATCHES(LANG(?city), "ru")) FILTER
(CONTAINS(?city, "Volochaevka"))
}
LIMIT