JupyterLab outputs have a mime type. Depending on the mimetype, a different renderer is used. For example, text is shown as plain text and an image is binary wi

JupyterLab outputs have a mime type. Depending on the mimetype, a different renderer is used. For example, text is shown as plain text and an image is binary with the image type (e.g. png). There is also a mimetype for Vega and Vega-Lite JSON. What this means for you as a user is that you don't need to install the renderer as it comes with the JL frontend. Vega-Lite is client side so it's not running in the kernel.