Please forgive the tardiness of this reply.
Your answer depends on the individual piece. For a through-composed piece - one with no repeats, I think measure numbers would suffice if the verses are not specifically labeled as such.
However, if you are transcribing the music for only the first verse of a strophic song and then brailling only the text for the remaining verses, you must list verse numbers, as seen in example 35.7-1 in the MBC2015.
If the refrain is obvious and a part of the repeated music that is not brailled in full the second/third time around, you would label it as such, even if the label is not shown in print. (Ex. 35.7.2-1)
Those added labels help the reader orient themselves when there are repeated portions of music that we are not transcribing in full.