Using UI5 Inbox for Workflow?

Hi all,

   I like to use a UI5-Inbox for my workitems. The basic idea is, to use a UI5-Inbox similar to an Business-Workplace-Inbox, because the users don't like to login in SAP but using a modern inbox.

Here my questions:

1. Is there at last a SAPUI5 inbox avaible out of the box? Friom which SAP release on?
2. If the question 1.) can be answered with YES: How can I set up a UI5 Inbox? Which steps are necessary?
3. Which requirements must a workitem fulfill, if it should be executed out of a UI5 inbox?

Many thanks in advance.

   Regards

            Elmar