Hello Mario,
I am not really sure, which bridge? You mean the elevated tracks of the monorail?
The monorail's track design is shown in the video on the webpage of Linea 3, the tunnel was shortened by some hundred meters to save money.
Unluckily, "monorail track" is not available as "under construction" and if you tag it as "construction:railway=monorail", it does not show up in railwaymaps as a monorail, but as railway.
It is a little bit tricky, but for this few cases worldwide and just for the time of construction, it might work out like this.
With regards, Anna Catarina