Placement of Controls is nice but where is Meta?

I have something like this

;; ----- language server

(require 'eglot)
(add-hook 'python-mode-hook #'eglot-ensure)
(add-to-list 'eglot-server-programs
	     `(python-mode
	       . ,(eglot-alternatives '("pylsp"
					"jedi-language-server"
					("pyright-langserver" "--stdio")))))

;; ----- treesitter

(use-package treesit-auto :ensure t)
;; treesit grammar should be installed here: "~/.emacs.d/tree-sitter/"

;; ----- select interpreter

(setopt python-shell-interpreter ("~/miniconda3/bin/python"))
(setopt python-shell-interpreter-args "-i")

;; ----- conda

(use-package conda
  :ensure t
  :custom
  (conda-anaconda-home "~/miniconda3")
  (conda-env-home-directory "~/miniconda3")
  (conda-env-subdirectory "envs")
  :config
  (unless (getenv "CONDA_DEFAULT_ENV")
    (conda-env-activate "base"))))

;; ----- emacs-jupyter

(use-package jupyter
  :commands
  (jupyter-run-server-repl
   jupyter-run-repl
   jupyter-server-list-kernels))
(org-babel-jupyter-override-src-block "python") ;; so python becomes jupyter-python in org-babel

;; ----- other settings

(setopt python-indent-guess-indent-offset-verbose nil)

doesn’t plantuml follow a language specification (UML) whereas D2 is based on the creator’s own syntax?