Customised commands used in tblr environment

[cdacl]

I want to type several cells in a row repeatly within different tables, like this:

| grade 1 | grade 2 | grade 3 | grade 4 | grade 5 |

so I defined a command with the context above:

\newcommand\test{grade 1 & grade 2 & grade 3 & grade 4 & grade 5}

I used this with Tabularx,

\newcommand\test{grade 1 & grade 2 & grade 3 & grade 4 & grade 5}

The \emph{Tabularx} output: 

\begin{tabular}{|c|c|c|c|c|}
\hline
\test \\
\hline
one & two & three & four & five \\
\hline
\end{tabular}

and output was ok.

I used this in tblr, but the output was not as I expected. The codes:

The \emph{tblr} output with $\backslash$newcommand:

\begin{tblr}{|c|c|c|c|c|}
\hline
\test \\
\hline
one & two & three & four & five \\
\hline
\end{tblr}

The output:

I changed the newcommand with NewTableCommand, It's not as expected, too. The codes:

\NewTableCommand\testtblr{grade 1 & grade 2 & grade 3 & grade 4 & grade 5}
The \emph{tblr} output with $\backslash$NewTableCommand:

\begin{tblr}{|c|c|c|c|c|}
\hline
\testtblr \\
\hline
one & two & three & four & five \\
\hline
\end{tblr}

The output:

How can I make it works like Tabularx package?

Thanks.

[lvjr]

You can not put cell text inside \NewTableCommand. In the latest source code (which will be in the next release planned on 1st August) there is an expand option for expanding command once. See #18 and #23.

[cdacl]

I got it. Thank you very much.

[lvjr]

Workarounds for current version:

https://tex.stackexchange.com/questions/604228/tabularray-reading-a-table-stored-in-a-macro-by-catchfile

https://tex.stackexchange.com/questions/604483/column-delimiter-in-a-macro-to-render-rows-for-tabularray

[cdacl]

I temporarily use \expandafter to solve this problem. Thank you!