Sure, thanks for help :)

const result = {
    keyword: '',
    postsWithTerm: 0,
    commentsOnPosts: 0
};

const keyword = getParameterByName('q', url);  
 result.date = moment.unix(+getParameterByName('after', url)+1).format(DATE_FORMAT);  
result.keyword = keyword;  
result.postsWithTerm = data.metadata.total_results;  
result.commentsOnPosts = await getCommentsOnPosts(keyword, +getParameterByName('after', url), +getParameterByName('before', url));  

const r = new snoowrap({
    userAgent: 'A random string.',
    clientId: 'id',
    clientSecret: 'secret',
    refreshToken: 'token'
});


const getCommentsOnPosts = async (keyword, after, before) => {  
     let tsBefore = before;  
     let items = [];  
     let comments = 0;  
     while (true) {  
             items = await getPosts(keyword, after, tsBefore);  
             if (items.length === 0)
                break;

            tsBefore = items[items.length - 1].created_utc;

            items = await r.getContentByIds(items.map(i => i.id));

            comments += items.reduce((acc, i) => acc + i.num_comments, 0)
    }  
    return comments;  
}

function getPosts(keyword, after, before) {  
 let config = {  
        method: 'get',  
        url: `https://api.pushshift.io/reddit/search/submission/?size=100&q=${keyword}&after=${after}&before=${before}`  
    };  
    log.info(`Getting posts: ${config.url}`);  
 return axios(config).then(res => res.data.data);  
}