Fusion 3d map problem

Hello to everyone, im making a 3d map for a real estate video, i made the 3d map with a plugin called BlenderGis for the blender program, now that i have the 3d model on Davinci im having a hard time figuring out how to paint on top of the 3d map, what im trying to do is highlight the roads with a red line, any ideas on how to do this? is this even posible to do on Davinci? (i alredy looked for tutorials everywhere and i couldnt find anything, also im super amateur so if you have a solution give me the dumbproof version )
Any help would be very appreciated.