Since then I found that there is a survey that you can use to find out whether a specific feature is a good idea or not.

It is survey.io and here is how you can use it to measure product-market fit. In a nutshell it is a great survey to find out which features are core features, and which features are irrelevant — according to the users’ perception.

Although there are some limitations:

You need to have a functioning product with a significant amount of active users. So that you can survey a meaningful pool of people about existing features (and not fantasy features).

All in all it seems to be a great tool for shaping existing products, but as for new products/new features the customer development interview remains the go to method regarding customer needs.