Question:  Is it safe to process food in the oven?

Based on information from the National Center for Home Food Preservation, the answer is No. “This can be dangerous because the temperature will vary according to the accuracy of oven regulators and circulation of heat. Dry heat is very slow in penetrating into jars of food. Also, jars explode easily in the oven." 

Here is a link to additional research-based information on this topic: https://extension.psu.edu/canners-and-canning-methods-that-are-not-recommended