Trouble with metadata postprocessor

[Twi-Hard]

Something came up that makes it so I really need to store the jsons in a separate location from the files downloaded. For other parts of the config I was able to set the base directory for the jsons but most sites use this postprocessor which I have no idea how to do that for (blacklist is truncated):

{
  "name": "metadata",
  "mode": "json",
  "extension": "json",
  "extension-format": "{extension!l}.json",
  "event": "file",
  "mtime": true,
  "blacklist": [
    "..."
  ]
}

I've tried setting a base-directory in that, but it didn't work.
What I need is for the base directory to be "/abc/environment/json/" then "{_env[domain]}" then the relative path from the base directory of the image path to the image location appended to that.

For example, here's an image path:
/abc/archive/other/artstation.com/artist/xelabo/artstation_3480036_12129584_Sunset Shimmer .jpg
Here's the path the json should download to:
/abc/environment/json/artstation.com/artist/xelabo/artstation_3480036_12129584_Sunset Shimmer .jpg.json

In that example:

• /abc/environment/json/ is the base directory
• artstation.com is "{_env[domain]}" (filled in by my script)
• artist/xelabo/ is the relative path to the file

It would take an enormous amount of work to make a separate postprocessor for every site that uses this postprocessor so hopefully there's some easy way to do this.

Does anybody know how to make this work?

Edit: I guess I should have said what I tried. I tried this but have no clue what else I could do:

"base-directory": [
  "abc",
  "environment",
  "json",
  "{_env[domain]}"
],

I couldn't find the json when I did that.

[mikf]

I don't think this is currently possible, especially the "then the relative path from the base directory of the image path" part. I'll see if I can come up with something.