TikZ forest - Align extra contents added on the right of the final nodes

Question

To explain "probabilistic" tree, I would like to add extra texts. I would like to align vertically all this extra texts. Is it feasible?
Is it also possible to have perfect baseline alignment between node and its extra content?
Does the package forest give easy to use names to the nodes of the tree?
documentclass[12pt]{article}

RequirePackage{forest}
useforestlibrary{linguistics}

forestset{
  extra/.style={
    edge label={
      node [xshift=1.5cm] {$leftarrow$ #1}
    }
  }
}

begin{document}

begin{forest}
  for tree = {%
    sn edges,
    grow'  = 0,
    anchor = parent,
  },
  [
    [A
      [B, extra=b]
      [C, extra=c]
    ]
    [D
      [E, extra=e]
      [F
        [G, extra=g]
        [H, extra=h]
      ]
    ]
  ]
end{forest}

end{document}

js bibra · Answer

A pointer in the right direction -- instead of extra style a write me style is defined taking the forest tree as in a bounding box--the inward pointing arrows can (later) be modified to cater for the the length  from tagZ to nodeB  from--
https://tex.stackexchange.com/a/398722/197451

documentclass[12pt]{article}

RequirePackage{forest}
useforestlibrary{linguistics}

forestset{
  extra/.style={
    edge label={
      node [xshift=1.5cm] {$leftarrow$ #1}
    }
  }
}

begin{document}

begin{forest}
  for tree = {%
    sn edges,
    grow'  = 0,
    anchor = parent,
  },
write me/.style={
    tikz+={
        node [anchor=mid west, red] at (.mid -| write me coord) {$leftarrow$ #1};
    },
},
tikz+={
    coordinate (write me coord) at (current bounding box.east);
}
  [
    [A
      [B, write me=tag Z]
      [C, extra=c]
    ]
    [D
      [E, extra=e]
      [F
        [G, extra=g]
        [H, write me=tag T]
      ]
    ]
  ]
end{forest}

end{document}

TikZ forest - Align extra contents added on the right of the final nodes

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