Set custom template for tooltip

[just-website]

I use AceEditor as a JSON file editor. For validation, I use the AJV library and make objects of annotations.
In discussions here, I saw an example with a custom HoverTooltip for creating tooltips when hovering over content (with the tooltip.showForRange method). Similarly, I'd like to be able to set a custom template for GutterTooltip.

Can I disable (override) an existing default GutterTooltip instance?

Can I access existing tooltip instances?