Hi @chughtaimb ,
Here’s a link to the [https://www.partselect.com/Models/JVM1870SK03/Sections/MICROWAVE/?ModelID=501660&ModelNum=JVM1870SK03&mfgModelNum=&ManufactureID=2&Selected=00121509i01&Position=1&mfg=GE&Type=Microwave&Mark=1|parts] for your microwave. The handle is part #1.
The link was only to show you the part and what it may cost.
There are other suppliers online that may suit you better.
Just search for ''JVM1870SK03 parts'' to get results for suppliers.