3SM Scalable Mesh Transparency in LumenRT

Hi, Is there a way to apply transparency to 3SM scalable meshes in LumenRT? I tried to export files from OpenRoads Designer with one or two 3SM meshes attached and transparency levels set to each mesh attachment (as this gives good visual effect for models in cut). But when the file is exported and opened in Lumen RT Pro (Update 14) the 3SMs are shown without transparency. I couldn't find any relevant setting in LumenRT.

Regards,

Mariusz