How to use the notion.markdown.notion_to_markdown function in notion

def _convert_notion_to_python(self, val, prop):

        if prop["type"] in ["title", "text"]:
            val = notion_to_markdown(val) if val else ""
        if prop["type"] in ["number"]:
            if val is not None:
                val = val[0][0]
                if "." in val:
                    val = float(val)
                else:
                    val = int(val)
        if prop["type"] in ["select"]:
            val = val[0][0] if val else None
        if prop["type"] in ["multi_select"]:
            val = [v.strip() for v in val[0][0].split(",")] if val else []
        if prop["type"] in ["person"]:
            val = (
                [self._client.get_user(item[1][0][1]) for item in val if item[0] == "‣"]
                if val
                else []

def api2py(x):
        x = x or [[""]]
        if markdown:
            x = notion_to_markdown(x)
        return api_to_python(x)

return [["‣", [["d", data]]]]


class Collection(Record):
    """
    A "collection" corresponds to what's sometimes called a "database" in the Notion UI.
    """

    _table = "collection"

    name = field_map(
        "name", api_to_python=notion_to_markdown, python_to_api=markdown_to_notion
    )
    description = field_map(
        "description",
        api_to_python=notion_to_markdown,
        python_to_api=markdown_to_notion,
    )
    cover = field_map("cover")

    @property
    def templates(self):
        if not hasattr(self, "_templates"):
            template_ids = self.get("template_pages", [])
            self._client.refresh_records(block=template_ids)
            self._templates = Templates(parent=self)
        return self._templates

    def get_schema_properties(self):
        """
        Fetch a flattened list of all properties in the collection's schema.
        """