Data communication between MQTTPUB and MQTTSUB blocks

I have a 2-dimensional data set that I would like to transfer using MQTTPUB and  to be received by the MQTTSUB block.

Can this be done? In the MQTTPUB block, I can only entry for the "array separator" meaning I can only send I dimensional data? Is it so?

On the other side, for the MQTTSUB block, I can see option for "row size" and "column size".

Thanks