In that case it might be possible, since built blocks are slightly different than terrain blocks in terms of definition, and there might be a place somewhere where you could probably define different material maps for your built blocks.
Not sure tho, just guesswork - never delved much into building, I do know that the blocks are rendered differently however, and with more flexbility.
I remember I got a “glass” building block to work once, while testing greenhouse building for glassworks - but it was slightly bugged out (mostly because it was transparente) so you can definitely get shiny materials.
I think that the problem you might encounter was the same that I encountered when making obsidian (which is also shiny/uses that exact shader), which is the fact that for some reason the shine/glow only appears on the top faces of objects, not on sides
Which means that larger objects aren’t as shiny unless someone edited the shader to make the shine effect render on vertical surfaces too, something which I don’t know how to