I was look a formual or description how to calculate standard error of ŷi or usually called asymptotic standard error in non-linear regression:

In my case is exponential regression: Y = exp(aX) where 'a' is constant.

the standard error or should be estimated for each ŷi.

Is there any online resource which explains good.....

Look the attachment for the formula, where F is the matrix of derivatives for approximating least squares estimations and Fi denotes the ith row of F matrix and where σ2 is the MSE.