\documentclass{article}
\usepackage{tikz-cd} 

\begin{document}

\[ \begin{tikzcd}
p\in P \arrow{r}{h} & Q \arrow{d}{j}\arrow{r}{i}&R \\%
\phantom{p\in}S \arrow{r}{k}& T\arrow{r}{l}&U
\end{tikzcd}
\]

\[ \begin{tikzcd}
P \arrow[r, Rightarrow, "h"] & Q \arrow[d, Rightarrow, "j"]\arrow[r, Rightarrow, "i"]&R \\%
S \arrow[r, Rightarrow, "k"]& T\arrow[r, Rightarrow, "l"]&U
\end{tikzcd}
\]


\end{document} 