generateReport

function generateReport() {
   const outputElement = document.querySelector('#output');
   const result = [];
   const checks = Array.from(document.querySelectorAll('thead tr th input'));
   const trs = Array.from(document.querySelectorAll('tbody tr'));

   trs.forEach( row => {
    const current = {};
    Array.from(row.querySelectorAll('td')).forEach((x, i) => {
        if(checks[i].checked) {
            current[checks[i].name] = x.textContent
        }
    })
    result.push(current)
   })
   outputElement.value = JSON.stringify(result)
}