For OnCloud (hosted), can't.
Best you can do to leverage your node.js assets from Business Central is to host your node app on azure or as on-prem always-running app (docker/linux/windows/whatever). So long as the node app exposes am http REST interface (e.g. express.js), your extension can call it via NAV's native HttpClient, XmlDocument, and JsonObject datatypes that are available to both C/AL and AL.
For OnPrem, technically it's possible to call a node.js script directly via dotnet interop (e.g. System.Diagnostic.Process to launch a process). keep in mind that if you take this direction, your extention will never work in BC OnCloud. Microsoft has made it very clear that .net interop will be for on-prem AL extensions only.
