Ability to use line-format for non-JSON encoded logs

[IvanRibakov]

Is your feature request related to a problem? Please describe.
I'm dealing with non-JSON log files that contain variable-width source file identifiers.
I would like to align log entries using line-format's min-width, max-width, align and overflow settings.

Describe the solution you'd like
I'd like to be able to use field names from the value object in the line-format's field field.

Describe alternatives you've considered
I saw that values have a rewriter field but I was unable to understand from the documentation how to achieve what I would like to using that field. Also, I'm not looking forward to re-implement abbrev logic when it is already available elsewhere.

Additional context

Example of the input logs:

poc  2024-09-20T07:01:20.111540Z INFO    1:Microsoft.Extensions.Hosting.Internal.ApplicationLifetime:0   Content root path: /foo/bar
poc  2024-09-20T07:01:20.111615Z DEBUG   1:Microsoft.Extensions.Hosting.Internal.Host:0   Hosting started
poc  2024-09-20T07:01:30.083486Z INFO    7:Foo.Bar.BarService:34   Worker running at: 09/20/2024 07:01:30 +00:00

Desired output:

poc  2024-09-20T07:01:20.111540Z INFO    1:    M.E.H.I.ApplicationLifetime:0   Content root path: /foo/bar
poc  2024-09-20T07:01:20.111615Z DEBUG   1:                   M.E.H.I.Host:0   Hosting started
poc  2024-09-20T07:01:30.083486Z INFO    7:                F.B.BarService:34   Worker running at: 09/20/2024 07:01:30 +00:00

Here is the custom format file that I'm working with

{
    "$schema": "https://lnav.org/schemas/format-v1.schema.json",
    "indigital": {
        "description": "Format file generated from regex101 entry",
        "regex": {
            "std": {
                "pattern": "^\\s*(?<prod>\\w+)\\s+(?<timestamp>\\d{4,4}-\\d{2,2}-\\d{2,2}T\\d{2,2}:\\d{2,2}:\\d{2,2}.\\d{0,6}Z)\\s+(?<lvl>\\w+)\\s+(?<pid>\\d+):(?<source>.+?):(?<line>\\d+)\\s+(?<msg>.+)$"
            }
        },
        "value": {
            "line": {
                "kind": "integer"
            },
            "lvl": {
                "kind": "string"
            },
            "msg": {
                "kind": "string"
            },
            "pid": {
                "kind": "integer"
            },
            "prod": {
                "kind": "string"
            },
            "source": {
                "kind": "string"
            },
            "timestamp": {
                "kind": "string"
            }
        },
        "level-field": "lvl",
        "body-field": "msg",
        "sample": [
            {
                "line": " poc  2024-09-19T15:33:52.428593Z INFO  5:Foo.Bar.BarService:34   Worker running at: 09/20/2024 07:01:30 +00:00"
            }
        ]
    }
}