What kind of feature are you missing? Where do you notice a shortcoming of PTB?

Bot API 9.1

Describe the solution you'd like

Checklists

• Added the class ChecklistTask representing a task in a checklist. Full Support for Bot API 9.1 #4847
• Added the class Checklist representing a checklist. @Bibo-Joshi API 9.1 Checklist* classes #4848
• Added the field checklist to the classes Message and ExternalReplyInfo, describing a checklist in a message. @Bibo-Joshi API 9.1 Checklist* classes #4848
• Added the class ChecklistTasksDone and the field checklist_tasks_done to the class Message, describing a service message about status changes for tasks in a checklist (i.e., marked as done/not done). @Bibo-Joshi API 9.1 Checklist* classes #4848
• Added the class ChecklistTasksAdded and the field checklist_tasks_added to the class Message, describing a service message about the addition of new tasks to a checklist. @Bibo-Joshi API 9.1 Checklist* classes #4848

• Added the class InputChecklistTask representing a task to add to a checklist. @aelkheir API 9.1 InputChecklist[Task] classes and bot.send/edit_checklist #4857
• Added the class InputChecklist representing a checklist to create. @aelkheir API 9.1 InputChecklist[Task] classes and bot.send/edit_checklist #4857 API 9.1 InputChecklist[Task] classes and bot.send/edit_checklist #4857
• Added the method sendChecklist, allowing bots to send a checklist on behalf of a business account. @aelkheir API 9.1 InputChecklist[Task] classes and bot.send/edit_checklist #4857
• Added the method editMessageChecklist, allowing bots to edit a checklist on behalf of a business account. @aelkheir API 9.1 InputChecklist[Task] classes and bot.send/edit_checklist #4857

Gifts

• Added the field next_transfer_date to the classes OwnedGiftUnique and UniqueGiftInfo. @harshil21
• Added the field last_resale_star_count to the class UniqueGiftInfo. @harshil21
• Added “resale” as the possible value of the field origin in the class UniqueGiftInfo. @harshil21

General

• Increased the maximum number of options in a poll to 12.
• Added the method getMyStarBalance, allowing bots to get their current balance of Telegram Stars. @harshil21
• Added the class DirectMessagePriceChanged and the field direct_message_price_changed to the class Message, describing a service message about a price change for direct messages sent to the channel chat. @harshil21
• Added the method hideKeyboard to the class WebApp. @harshil21

Describe alternatives you've considered

If you want to contribute, you can start from the Contribution Guide.

Additional context

Please comment below before start working on any part of the update so as to keep things in track and avoid double work.