Great plugin.

I’m not sure I follow the question.

You are asking if it’s possible to add a button so you can add charts to a post from a list of already created ones while editing a post?

That’s certainly possible and spending some time building a blocks interface is on my list of to do items once I have the time.

If you install Shortcake I’ve supported that in the plugin and it does exactly that for non Block editing. But know that Shortcake’s devs have abandoned it as far as I can tell.

Yes I meant that. I am using classic editor and want to add a button to insert chart. So can I still use Shortcake?

You certainly can try. I haven’t tested it in awhile though and as I said, the developers abandoned it. But if it still works that would provide what you are asking for.