Update!
I worked it out without using WebViews Midi.
It was as simple as calling a javascript function from onController.

function onController() { WebView1.callFunction("updateCC", { "cc":Message.getControllerNumber(), "value": Message.getControllerValue() }); }

@VeryHuman
Maybe you should have a look at the custom sample import demo project from Christoph:

Link Preview Image GitHub - christophhart/hise_tutorial: The Tutorial project for HISE

The Tutorial project for HISE. Contribute to christophhart/hise_tutorial development by creating an account on GitHub.

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GitHub (github.com)