[Q] Can’t find the confidence and prediction intervals for predicted values obtained with a nonlinear model

Software is R. Basically, I’m predicting values with two models, one linear and the other one non linear. If I type:

predict(linear_model, newdata = predict_data, interval = “confidence”)

and

predict(linear_model, newdata = predict_data, interval = “prediction”)

it gives me the predicted values with the linear model, however the same code with the nonlinear model instead of the linear one, only gives me the prediction without the confidence intervals and the prediction intervals. Is there a way to solve this?

confidence datascience prediction values