Hi fistudio,
Maybe not the best solution but it works. Just create a chunk, for example
brackets, and put the following in it
data-interchange="[ [[*TVname]], small], [ [[*TVname]], medium]"
Notice the extra space I did put after the first square brackets, because with this space between the three brackets MODX will render it as TV.
The call in your code will be the following
<div [[$brackets:replace=`[ ==[`></div>
I did use an output filter to filter the extra space created in the first step. If Foundation does not care about the extra space you can just call the chunk without the output filter.