Insert Custom Tag in CKEditor

Hi,

I am trying to insert following tag into CkEditor RTE, but I dont know how I can

<customcontent uniquename="uniqueid">Name</customcontent>


I tried using insertHTML but when I executed it is ignoring the non html tags. Is there any setting to clean non-HTML tag.

I also tried with insertElement, it is throwing some javascript error.

Can someone provide me example to crack this?