\begin{table}
\centering
\begin{talltblr}[         %% tabularray outer open
caption={blah\_blah},
]                     %% tabularray outer close
{                     %% tabularray inner open
colspec={Q[]Q[]Q[]},
column{1}={}{halign=l,},
column{2,3}={}{halign=r,},
}                     %% tabularray inner close
\toprule
& mean & sd \\ \midrule %% TinyTableHeader
mpg & \num{20.09} & \num{6.03} \\
hp & \num{146.69} & \num{68.56} \\
\bottomrule
\end{talltblr}
\end{table} 
