Add SP Group to folder using CSOM/Javascript

Hi,

Is it possible to add a SharePoint Group to a folder in a Document Library using client side javascript?

We can't use the normal methods because SP.Folder object doesn't have get_roleAssignments() method. I'm looking to run a script from a page within a Script Editor wp to get this done from a button click.

I'm not creating an app but trying to achieve this from an aspx page using a script editor webpart.

Regards,

Manoj