cannot specify alias to run a specific function

[TheAfroOfDoom]

i want to specify an alias so i can run a specific function. when i try the following config file though, it fails to load:

config/commandaliases/soul-0.json

{
  "schemaVersion": 1,
  "commandMode": "COMMAND_REDIRECT_NOARG",
  "command": "s0",
  "redirectTo": "function _:soul/0"
}

[SERVER] COMMAND_REDIRECT - Could not find existing command "function _:soul/0": C:\Users\afro\AppData\Roaming\.minecraft\config\commandaliases\soul-0.json

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similarly, i was hoping i could specify an alias to what is partially a function, but this doesnt seem to work. e.g.

/a <...> -> /function _:attack/<...>