Attaching a small rhombus with a circular bullet at its bottom

I wanna attach (means by adding a second arrow) a small rhombus with a circular bullet at its bottom to the following drawing:

\documentclass{article}    \usepackage{amsmath}    \usepackage{tikz-cd}    \usetikzlibrary{shapes.geometric}    \begin{document} \[      \begin{tikzcd}[sep = 2em,        /tikz/rhombus/.style={shape=diamond,draw,minimum size=2em},        execute at end picture={          \draw [densely dashed] (foo.north west) -- (foo.north east);          \draw [densely dashed] (foo.south west) -- (foo.south east);        }        ]     |[rhombus,draw,minimum size=3em, alias=foo]|{}\arrow[r,shorten >=0.5em,shorten <=0.5em] &      |[rhombus,append after command={\pgfextra{\let\myln\tikzlastnode}     (\myln.north) node[anchor=south,rhombus] {}     (\myln.south) node[anchor=north,rhombus] {}}]|{}\\    \end{tikzcd}    \]\end{document}

Any help will be greatly appreciated!