I agree with @amosbastian. 3 days for this TR is too short in my opinion most specially if you're considering who your target developer (full-time free lancer with extensive react experience?) for this is. Base your target developer on who responded to your previous TRs.

You have to consider possible issues that may arise as well. Even though existing code is there, I think it's better if put (negotiable) for the deadline and get feedback or get the actual estimate from the developer who will do the task.

As mentioned in another comment too, please consider creating a UI design (graphic?) TR before creating a development TR. This way you'll get suggestions from User Experience (UX) developers like @mkt on the possible screen layout for the function you want implemented with the goal of providing good UX.