Letting users create own visuals and save

Hi there, I'm new to Power BI and I have the following requirements that I'd very appreciate your input on:

- We have external users using our power BI license to view reports/visuals, so this is an App owns data scenario

- We need to create a "Dashboard" for users, each user will be provided a "visual" builder where they can choose the type of chart, data sources and the corresponding fields to feed into that visual (we will give users a predefined list of fields)

- The visual can be saved so that next time user comes to the dashboard the visuals automatically load up

Now initially I though I needed to implement power BI custom visuals, but the more I dig into it the more I think this is not the right approach (I think power BI visuals are more for... developers..??), I'm wondering if this is even possible with power BI embedded. 

Can someone please guide me in the redirection? How could this be made possible with power BI?