Better way to make a string with template variables in java

Hi,
I have been working with GraphQL queries for Github...
I am building for example the following query to be sent to Git to fetch the number of pullRequests, issues,...etc...

{
  repository(owner: "ta", name: "otes") {
    pullRequests(states: OPEN) {
      totalCount
    }
    issues(states: OPEN) {
      totalCount
    }
    refs(refPrefix: "refs/heads/") {
      totalCount
    }
  }
}

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This works if you type it in :
https://developer.github.com/early-access/graphql/explorer/
But if you see in the network tab a string of the similar nature gets passed.. How i am doing this currently in Java is :

 public String queryForRepoInfo(String owner, String repo) {
        String ownerWithQuotes = "\\\"" + owner + "\\\"";
        String repoWithQutoes = "\\\"" + repo + "\\\"";
        String query = "{\n" +
                "  repository(owner: " + ownerWithQuotes + ", name: " + repoWithQutoes + ") {\n" +
                "    pullRequests(states: OPEN) {\n" +
                "      totalCount\n" +
                "    }\n" +
                "    issues(states: OPEN) {\n" +
                "      totalCount\n" +
                "    }\n" +
                "    refs(refPrefix: \\\"refs/heads/\\\") {\n" +
                "      totalCount\n" +
                "    }\n" +
                "  }\n" +
                "}\n";

        return query;
    }

    public void executIt(String query) {
        String data = "{ \"query\" :" + "\"" + query + "\"" + ", \"variables\" : \"{}\" " + ", \"operationName\" : null}";
        data = data.replaceAll("(\\r|\\n|\\r\\n)+", "\\\\n");
        JsonNode jsonNode = restTemplate.postForObject(gitGraphQlUrl, data, JsonNode.class);

    }

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This seems to be a bug prone and ugly way to do it... Please suggest an alternative way to do the same...

Thanks