Canvas text search issues

[AKA-SILENCE]

Hello , I need help with at least an idea or approach on developing a search tool or program to search text inside a flutter web app. Its text is rendered and not visible under canvas , it's more as a pixel / image , I'm developing a method to mimic Ctrl f function or find extensions , to provide live and fast highlighting , OCR is an not a good solution since it doesn't waste a lot of time and not 100% accurate , for the record there is no extension or find tool or program or anything can mimic Ctrl f for canvas texts since it does appear as image, specially if the text isn't exposed , anyone has useful ideas ? Whatever you got may be useful , even if it's just an idea