Move custom field value in ritm to approvers

[LuLe Game]

Hello everyone
I need your help with the sysapproval_approver table. First I have a ritm (catalog item), and in this ritm I have a custom field (text field for comments). I would like to pass the value of this custom field to the comments field (highlated below) of the approvers through a Business Rule. But the script, and I have tried multiple ones, none have worked. Can anyone tell me if it can be achieved with a script or does it need to be done in a different way?

[LuLe Game]

Thanks Anvesh for your help, I think your approach can help but I have not tested. I already identify the issue before and it was just to add quotation marks, like below: 

...

gr_approvalinfo.comments = '' + current.u_customfield;

gr_approvalinfo.update();

}

[AnveshKumar M]

@LuLe Game Adding those quotation marks will convert the value to string instead of a reference, and when we use getValue() it will return the field value as string only.