Wanted to bump this thread. Also new to Power BI, and looking to do the same as Sanket. It appears that we can only embed existing reports that have been pre-built using Desktop, but I would like my end users to be able to start with a blank slate, pick and choose the fields they'd like to use in their reports, choose the visualization to be used, and then save the report for re-use / share with others. Maybe even use an existing report as a starting point to build a new report on-the-fly.
Another "standard" feature that seems to be missing is the ability to switch between visualization types once a report has been built. Does this functionality exist?