Adding custom arguments to a custom language

[NixBiks]

I'm trying to add a custom argument to a custom language but I can't seem to get it working the config system. Is it possible? How?

I hope the following example makes it clear what I'm trying to achieve

import spacy
from spacy.lang.en import English
from spacy.tokens import Doc
from spacy.util import registry
from spacy.vocab import Vocab


def preprocess_text(text: str) -> str:
    return text + " preprocessed"


@registry.languages("my_custom_lang")
class CustomLanguage(English):
    lang = "my_custom_lang"
    Defaults = English.Defaults
    preprocess_text: bool = False

    def __init__(
        self, vocab: Vocab | bool = True, preprocess_text: bool = False, **kwargs
    ):
        super().__init__(vocab, **kwargs)
        self.preprocess_text = preprocess_text

    def _ensure_doc(self, doc_like: str | Doc | bytes) -> Doc:
        if isinstance(doc_like, str) and self.preprocess_text:
            doc_like = preprocess_text(doc_like)
        return super()._ensure_doc(doc_like)


spacy.blank("my_custom_lang", config={"nlp": {"preprocess_text": True}})