 nix eval .#nixosConfigurations.boop.config.fileSystems."/boot" | nix run nixpkgs#nixfmt-rfc-style
{
  autoFormat = false;
  autoResize = false;
  depends = [ ];
  device = "/dev/md/esp";
  enable = true;
  encrypted = {
    blkDev = null;
    enable = false;
    keyFile = null;
    label = null;
  };
  formatOptions = null;
  fsType = "vfat";
  label = null;
  mountPoint = "/boot";
  neededForBoot = false;
  noCheck = false;
  options = [ "umask=0077" ];
  overlay = {
    lowerdir = null;
    upperdir = null;
    useStage1BaseDirectories = true;
    workdir = null;
  };
  stratis = {
    poolUuid = null;
  };
}

How would one go about setting up a simple BTRFS filesystem with two drives with the default profiles (single for data and raid1 for metadata)? I understand this can be done through Disko with a single partition layout for one drive and then adding the second device to the BTRFS filesystem with btrfs device add /dev/nvme1n1 /, and then balancing the filesystem. I was curious if this can also be done declaratively. My disko config that I've built just now looks as follows, but I don't know if it would work the way I want to (two drives in one balanced BTRFS filesystem):

{
  disko.devices = {
    disk = {
      main = {
        type = "disk";
        device = "/dev/nvme0n1";
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              size = "512M";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = ["umask=0077"];
              };
            };
            root = {
              size = "100%";
              content = {
                type = "btrfs";
                extraArgs = ["-f"];
                subvolumes = {
                  "/root" = {
                    mountpoint = "/";
                    mountOptions = [
                      "compress=zstd"
                      "noatime"
                    ];
                  };
                  "/home" = {
                    mountpoint = "/home";
                    mountOptions = [
                      "compress=zstd"
                      "noatime"
                    ];
                  };
                  "/nix" = {
                    mountpoint = "/nix";
                    mountOptions = [
                      "compress=zstd"
                      "noatime"
                    ];
                  };
                  "/swap" = {
                    mountpoint = "/.swapvol";
                    swap.swapfile.size = "16G";
                  };
                };
              };
            };
          };
        };
      };
      second = {
        type = "disk";
        device = "/dev/nvme1n1";
        content = {
          type = "gpt";
          partitions = {
            root = {
              size = "100%";
              content = {
                type = "btrfs";
              };
            };
          };
        };
      };
    };
  };
}