Boost Features that are not in channels:

• 😜 Access to custom emoji
Admins will be able to set emoji packs for groups. All participants will be able to use emoji from this pack in the group, even if they do not have a Telegram Premium subscription.

• 🎙 Transcription of voice messages
Group members will be able to transcribe voice messages sent to the group, even without a Premium subscription.

• ⚡ Removal of restrictions for those who boosted the group
Administrators will have the ability to remove general group restrictions for those who have given a certain number of boost to the group. For example: sending media is prohibited in the group, but users who have given 4 boosts, will be able to send them.

• 🅰 Real time translation
Each group member will have the ability to translate all messages in this chat in real time.

Source : 💌💌💌

Note 📖 : Translated post

🗣 "Voice to text conversion" from level 4

Thanks : 💌💌💌