'How to show Reactor marble diagram in quick documentation?

I'm new to IntelliJ Ultimate edition and I found that others can see the marble diagram of Reactor just like this enter image description here

... when they hover methods.

But I can only see this (just some texts, without any diagram picture): enter image description here

Is there any option for enabling to render the diagram?

This is my IntelliJ version. enter image description here



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