merge table data on front-end

[#1]

i have a requrement,

delivery number is coming from back-end with some material and required qntity, I'm ccanning the material and increasing count of scannrd qntity, and press save and send all data to backdend,

when after re-click on same delivery number table is looks as shown in img, want to merge table data on front-end and showing count in scanned quantity

here is my controller.js , I pushed my table data in array