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I would like to make the diagram

\documentclass{article}
\usepackage{amsmath,amsfonts}
\usepackage{tikz-cd}
\begin{document}
    \[
        \begin{tikzcd}
            A \arrow[r, bend left=40, "H\circ r", ""{name=U}]\arrow[r, bend right=40, "K", swap, ""{name=D}]    &\textbf{Abcd}\arrow[Rightarrow, "\eta", from=U, to=D].
        \end{tikzcd}    
    \]
\end{document}

perfectly symmetric. I've been trying to change the parameters after the bend left/right option but I don't think this is the right way to proceed. Is there a standard way to act, which is "robust" with respect to the whole diagram?

marked as duplicate by Raaja, Stefan Pinnow, Phelype Oleinik, Mensch, Mico Feb 26 at 19:51

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