SharPoint 2013 - Possible to add snippet directly on publishing page?

Within SharePoint 2013, on a publishing page, in edit mode, is there a way for us to write snippet right on SharePoint publishing page rather than directly on the .htm custom page layout? I want to write...

<!--SPM:<asp:LoginView id="mGroupA" runat="server"> -->
<!--SPM:<RoleGroups>-->
<!--SPM:<asp:RoleGroup Roles="GroupA">-->
<!--SPM:<ContentTemplate>-->

<h2>Yes! Only Group A can now see this stuff!</h2>

<!--SPM:</ContentTemplate>-->
<!--SPM:</asp:RoleGroup>-->
<!--SPM:</RoleGroups>-->
<!--SPM:</asp:LoginView>-->

If not is there an alternative approach to the publishing page that will give me the same effect?