PWA Custom Ribbon Action to pass projectuid

Guys I am struggling for couple days now, trying to find how to pass project id to the provider hosted app.

I have added Ribbon Custom action to "Ribbon.Tabs.PDP.Home", so when user navigate to project page, I want to be able to open my app and pass project id there?

<CommandUIHandlers><CommandUIHandler Command="Invoke_CustomAction"
                          CommandAction="~remoteAppUrl/Pages/Default.aspx?{StandardTokens}&amp;SPListItemId={projuid}"/></CommandUIHandlers>

This is a command handler, StandardTokens does not provide any parameter for Project ID.

Ant help?