I support this request and would also like something like Transo offers. Just a clarifying comment–although Transno offers a “mindmap” of sorts, it is a hierarchical structure that mirrors a traditional outline structure. I find that useful and would like it in Logseq.
But many people use “mindmap” to mean something where people can draw all sorts of lines, links, and connections between different nodes, add nodes anywhere on the canvas and move them around without changing their link structure, and other less restricted things that cannot so easily translate back and forth from markdown. So we should distinguish between an “outline mindmap” and a “free mindmap” (just making up these terms, hopefully you know what I mean).