Re-partition disk

here’s my nixos “Hardware configuration” file and as you can see there’s no swap partition, and i just wanna take the 16gb-17gb from home partition and give it away to the swap, any help?

# Do not modify this file!  It was generated by ‘nixos-generate-config’
# and may be overwritten by future invocations.  Please make changes
# to /etc/nixos/configuration.nix instead.
{ config, lib, pkgs, modulesPath, ... }:

{
  imports =
    [ (modulesPath + "/installer/scan/not-detected.nix")
    ];

  boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "usb_storage" "sd_mod" "rtsx_pci_sdmmc" ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ "kvm-amd" ];
  boot.extraModulePackages = [ ];

  fileSystems."/" =
    { device = "/dev/disk/by-uuid/e91aaccd-53e1-4c51-bdd3-e9fb58bf42d2";
      fsType = "ext4";
    };

  fileSystems."/boot" =
    { device = "/dev/disk/by-uuid/CE69-0014";
      fsType = "vfat";
      options = [ "fmask=0022" "dmask=0022" ];
    };

  fileSystems."/home" =
    { device = "/dev/disk/by-uuid/21e56820-9732-4c89-8b22-2226eef95215";
      fsType = "ext4";
    };

  fileSystems."/nix" =
    { device = "/dev/disk/by-uuid/6b4cf5b2-e174-439f-a391-746ecd8d90a2";
      fsType = "ext4";
    };

  swapDevices = [ ];

  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
  # (the default) this is the recommended approach. When using systemd-networkd it's
  # still possible to use this option, but it's recommended to use it in conjunction
  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
  networking.useDHCP = lib.mkDefault true;
  # networking.interfaces.wlo1.useDHCP = lib.mkDefault true;

  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
}

Boot a live ISO, partition from there.
If you’re not confident using command-line tools, then you can boot the GNOME ISO and use gparted to resize and create the swap partition.

The fileSystems.* settings are basically just your fstab, it’s not related to partitioning.

is it going to be reproducible?