I have created a custom Nextcloud app called GLX Radio. It draws from an up-to-date, maintained online database of approximately 40,000 radio stations, by radio-browser.info allowing you to search by genre or browse manually; clicking the star icon adds a station to your personal list.
You can also add your own stations via web links.
The radio features a pop-up mini-player. If you use Firefox as your primary browser, you can install my add-on, “GLX-Addressbar-X,” which allows you to hide the address bar for specific websites and saves that preference.
This gives you a freely movable mini-player without the address bar.
You can set up custom station logos, create folders, and assign individual stations to those folders.
The radio is compatible with Apple Watch and CarPlay.
It offers a wide range of features, and I am currently working on an English translation so users can select the language within the radio settings. It provides station statistics and displays what is currently playing. Installation instructions are available on GitHub GLX Radio in both German and English. GLX Radio includes a built-in equalizer that works only in the web GUI; Apple has blocked this functionality on other platforms.
The radio is largely mobile-compatible.
The GLX Radio has a great many functions and possibly a few minor bugs, but I am working on fixing them.
You can always find the latest version of my app on GitHub or on my personal homepage
GordonX.de
On my website, you will also find other Nextcloud apps I have created, as well as other programs.
A Github pull request for Nextcloud Apps already exists; once it has been approved, GLX Radio will appear in the Nextcloud Store and can be installed from there.
You can find other work by my Side on Github my repositories
Otherwise, simply install GLX Radio and give it a try. 
I am always interested in feedback and suggestions for improvement.
Preview Web GUI:
