The HA Nodered add-on works very well, make sure you install the Nodered companion from HACS if you want full functionality though, especially if you use the HA dashboard, it makes adding custom buttons and sensors that are backed with Nodered super easy.
I use it to manually implement controls and feedback for devices that have no official integration, or have poor integrations. You can do a lot with the simple modules and visual coding, but the real power comes with the function nodes where you can write your own code and make it as complex as you need.