Is there any way to get dedicated GPU, I need it for intensive photo editing, and video editing
I assume you are asking about the Librem 14 laptop or Librem Mini. Purism doesn’t offer a PC with a dedicated GPU. AMD GPUs require firmware proprietary (see amd, amd-ucode and amdgpu at https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/ ). The situation is worse with NVidia GPUs. Purism produces a Linux distro without blobs, which is why PureOS is endorsed by the FSF.
There is also the problem of getting Coreboot support for a dedicated GPU, which isn’t available as far as I know. Google doesn’t care about dedicated GPUs for its Chromebooks, and Google does most of the porting work for Coreboot.