Telethon client doesn`t send premium emojies

I need to send a message with premium emoji to a given entity using Telethon client. Telegram account connected to client has active premium subscription. Below is my python code:

await client.send_message(
        entity="me",
        message='<tg-emoji emoji-id="5301096984617166561">☝️</tg-emoji>',
        parse_mode="html"
    )

When I run it, instead of premium emoji with given id, regular emoji ☝️ is sent. Why? What is the right way to send premium emoji inside message with html parse mode?

How to send premium emoji with Telethon client.

1. Create custom parser:

from telethon.extensions import html
from telethon import types


class CustomHtml:
    @staticmethod
    def parse(text):
        text, entities = html.parse(text)
        for i, e in enumerate(entities):
            if isinstance(e, types.MessageEntityTextUrl):
                if e.url == 'spoiler':
                    entities[i] = types.MessageEntitySpoiler(e.offset, e.length)
                elif e.url.startswith('emoji/'):
                    entities[i] = types.MessageEntityCustomEmoji(e.offset, e.length, int(e.url.split('/')[1]))
        return text, entities

    @staticmethod
    def unparse(text, entities):
        for i, e in enumerate(entities or []):
            if isinstance(e, types.MessageEntityCustomEmoji):
                entities[i] = types.MessageEntityTextUrl(e.offset, e.length, f'emoji/{e.document_id}')
            if isinstance(e, types.MessageEntitySpoiler):
                entities[i] = types.MessageEntityTextUrl(e.offset, e.length, 'spoiler')
        return html.unparse(text, entities)

2. Set Telethon client`s parse mode:

client.parse_mode = CustomHtml()

3. Following HTML tags will be parsed as premium emoji when sending message if account in use has active premium subscription:

emoji_text = '<a href="emoji/{emoji_id}">{emoji_symbol}</a>'
await client.send_message(
    entity=entity,
    message=emoji_text
)