Zend certified PHP/Magento developer

How to add checkbox in orders credit memo page? magento 2

Basically I am trying to add checkbox beside each row of product and when that checkbox of any particular row is checked it will store checkbox value as 1 or 0 in sales_creditmemo_item table in magento backendenter image description here. Currently I am refferring to appdesignadminhtmlCompanyoverrideMagento_Salestemplatesordercreditmemocreateitems.phtml. Please feel feel free to drop any suggestion or advice if the question is not clear. It would be relly helpful for me to learn new magento 2 concepts