As I don't know everything it is possible to submit an idea of a new Power BI Custom Visual. Please use the link below to submit a request to my GitHub repository. I will look into all the requests and decide if it is worth to build and publish it.
Request new visual
All request for a custom visual that will result in a visual will be published on GitHub, licensed with a MIT license and if possible submitted to the Power BI Custom Visual gallery.
Please contact me if this is not working for you and/or if you have (additional) questions.