CSS pseudo class "has()" not supported

[PHPGangsta]

Hi!

I have a case with this CSS in an email:

p:has(br:only-child) {
    margin: 0;
    display: none;
}

I'm using
$config->set('Filter.ExtractStyleBlocks', true);

The result is:

p {
    margin: 0;
    display: none;
}

Looks like neither "has()" nor ":only-child" is supported? ":first-child" is supported as far as I saw.

Can I add those 2 missing CSS pseudo selectors/classes somehow via configuration?