On the B747-400 the 'True/Magnetic' reference switch determines how all systems display the wind. So, with the switch in 'True', the PFD, ND, RDMI and FMC all report wind in degrees True.
The means that the Pos Report page gives the ATC data in the required format and you just have to read it out to them. The one thing it doesn't do is store the mid point data though.