Can a macOS service be called from a web browser bookmark ?

I have a macOS service which works well. It is invoked from the "General" section of the "Service" menu in web browsers and requires no input. The workflow contains AppleScript which does what I need.

To make the Service more accessible I would like to call it using a web browser bookmark. That would require a custom URL scheme. However, as far as I can find, custom URL schemes can only call apps, not services.

Is that correct ? Are custom URL schemes only able to start apps or can they call a service ? If a custom scheme can call a Service, how ?

Thanks.