I know this post is old, sorry for that.
You can also type 10x
for cols and x2
for rows, if you want to have only one attribute.
[textarea* your-message x3 class:form-control] <!-- only rows -->
[textarea* your-message 10x class:form-control] <!-- only columns -->
[textarea* your-message 10x3 class:form-control] <!-- both
…
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