Custom Action in Link Field

You can add a new custom link option to the standard link field by defining the function in the namespace frappe.ui.form.ControlLink.link_options.

In the frappe.ui.form.ControlLink.link_options, you have access to the link field object.

1. Adding Custom Option

frappe.ui.form.ControlLink.link_options = function (link) {
	return [
		{
			html: "" + " " + __("Custom Link Option") + "",
			label: __("Custom Link Option"),
			value: "custom__link_option",
			action: () => {},
		},
	];
}; 

Once a function is assigned to frappe.ui.form.ControlLink.link_options, the link field will have a new link option: