If anyone is interested, here is the answer from support:

"According to the responsible department, the dimensions of the open compartment in the article Furn Chiaro I (TV furniture) are: 100 x 17 x 33.5 cm (width, height, depth). Behind the two doors on the outside, the article has the following internal dimensions: approx. 37.5 x 39 x 33.5 cm (width, height, depth)".