You can open up a local graph view for a particular note. In fact, a lot of people seem to prefer this method. It opens in a new tab though, not within your note.
I’m not sure if there’s any nicely located buttons. Probably best to open the command palette (left sidebar) and type “open local graph”. You could define a keybind for it as well.
I do like the idea of embedding graphs into notes though. Thinking about it, it’s kind of odd this isn’t a standard feature.