\begin{tblr}[         %% tabularray outer open
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]Q[]},
column{1}={halign=l,},
column{2}={halign=l,},
}                     %% tabularray inner close
\toprule
a & \{\} \\ \midrule %% TinyTableHeader
\num{1.00} & 4                        \\
\num{2.00} & \textbackslash{}times 5 \\
\num{3.00} & 6                        \\
\bottomrule
\end{tblr} 
