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Within Wikidata Query Service Query Helper the comment #TEMPLATE can build a simple template where the user can choose one or more variables to change a query without needing to know the SPARQL query language.

See below an example to select presidents and their spouses from any country:

#TEMPLATE={"template":"Presidents of ?country and their spouses","variables":{"?country":{"query":" SELECT ?id WHERE { ?id wdt:P31 wd:Q6256 . }"} } }

SELECT ?p ?pLabel ?ppicture ?w ?wLabel ?wpicture WHERE {
  BIND(wd:Q30 AS ?country)        # United States of America
  ?country (p:P6/ps:P6) ?p.       # Head of government
  ?p wdt:P26 ?w.                  # Spouse
    ?p wdt:P18 ?ppicture.
    ?w wdt:P18 ?wpicture.
  SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }

Try it!

The "template" contains the texts and one ore more variables.
The "variables" list the variables and optionally a "query" to select possible values, in this case ?id is instance of country.

If no query is needed the syntax is "?var1":{} In that case that might be
  #TEMPLATE={"template":"Presidents of ?country and their spouses","variables":{"?country":{} } }

Mind: BIND(wd:Q30 AS ?country) is used as a default for the variable ?country.

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