how to implement the seek function?

Could you please advise on how to implement the seek function? I have a flutter piano app, and I need to click on the notes of the score and then jump to the corresponding position for playback?

<img width="418" height="628" alt="Image" src="https://github.com/user-attachments/assets/daafb4f7-ac77-4e96-8b3f-cc00c5af8d1d" />