SaaS Fusion Current Page Url

I have a VBCS application embedded into a SaaS fusion page. The VBCS application needs the current SaaS fusion page url.

I am exploring whether I can use the expression editor to provide the current SaaS page url as a parameter to VBCS as below.

How to pass Fusion URL parameters to VBCS application embedded in Fusion? — Cloud Customer Connect (oracle.com)

Is it possible to get the current page url using the express editor. For example I know you can use the following:

#{securityContext.userName}

#{facesContext.externalContext.requestContextPath}

Thanks,

Mike