Save bookmark for part of aya

[zmadel]

Hello I have a suggestion that is very helpful for Quran Hafiz, many Hafiz need to put bookmark on a word or more that is commonly make mistakes in recitation to help him review the hafz quickly. I am a software developer and can participate in it, I know that there is currently bookmarks on pages or aya, but I need to add a word or more bookmark that always appear highlighted for easier Quran review. If someone has experience in the product, plz guide me to where in the app I should start ? Thanks