Hello @ManuPF
I have done a deep research regarding this situation and I would like to inform you that we can do provide you with the Footprint (.dra) and with the .STEP for the LS1046A with Package : FBGA780.
Please note that those files are not from certified libraries, in case that you would like to have those files we can provide them to you creating a new ticket using the technical support web located in the following link, also in order to keep on the same communication channel please do not forget to mention that this situation is linked to case 00593713.
https://support.nxp.com/s/
Best Regards,
Hector Villarruel Silvadoray