PHPStan with array shape doc

Question

I have an array like below:

array [
    "total" => 0,
    "seed" => 0,
    "stringKey1" => array<string, string>,
    "stringKey2" => array<string, string>,
    ...
    "stringKeyN" => array<string, string>
]

I have question about how to use Phpstan to document above array shape. the "stringKey"s are produced in run time.

I just donot know how to write down "stringKey" part of PHPStan document