Inlude difficulty levels to Trivia app

Trivia is a simple trivia question app. It has a nice interface with several categories. 18 to be specific. I have been playing the trivia question for a while, and I have been enjoying it.

I want to propose an idea of the complexity of the game.
When one pick any category, it opens, and ask if the player wants to play 5 - 10 - or more questions.
I want the implementation of difficulty levels on the first interface of the app. There will be a drop-down button on the top of the app that will include all set of difficulties. Such as easy, medium, hard and pro. I saw on the repo that question are sourced from opentdb.com. Now, there could be a way to filter questions from the database, based on the player selection on the app.
When I choose pro, though questions will be filtered for me to answers, and when I want easy, I will answer a very easy to answer questions.

Mock up

The image on the right hand side shows how the difficulty could be added.

This second image shows how the level will show when pressed. Users will choose what ever they can play, and enjoy the game.

Benefit

This is to make the interaction with the app easy. Many users would be struggling with some of the answers based on their capability. Users will be able to train themselves from easy to pro little by little.
This is a feature I believe will make the app very more useful, interesting and very much fun to play.

Thank you.

Trivia repo: https://github.com/lvamsavarthan/Trivia

My github: https://github.com/darewealth