Currently files in .pyproject are listed in single line. It's unreadable, when there are more files.

My suggestion is to list files in separate lines, with indentations.

Current state:

{
    "files": ["main.py","file1.py","file2.py"]
}

Suggestion:

{
    "files": [
        "main.py",
        "file1.py",
        "file2.py"
    ]
}