Importing a custom visual
The visuals included in Power BI out of the box will cover many use cases and be enough for most scenarios. If there are scenarios where the built-in visuals are not solving the requirements, then you should explore the custom visuals that have been made by many different developers found in AppSource, Microsoft's marketplace for Power BI visuals. If you can't find a visual you like, it is also possible to build your own custom visual for Power BI.
Microsoft AppSource contains visuals that have been created by Microsoft and Microsoft partners. Visuals can go through a certification process, so some visuals in AppSource have been certified and some have not. A certified visual has been tested and investigated by the Microsoft Power BI team to ensure it doesn't access external services or resources and that it follows secure coding patterns and guidelines. Certification is not a required process, but many custom visual developers will choose...