At the moment, if you want to use a MathJax URL other than the default CDN, you have to set it on your account in the editor. If you write some exams that need an internal MathJax and others for the public, this is inconvenient. It's also hard to enforce with lots of authors.
The LTI provider could make a MathJax URL available to the exam iframe, in the same manner as the SCORM API. It would have to give a dictionary with URLs for different versions, to allow for breaking changes in MathJax, such as 2.x vs 3.x.
At the moment, if you want to use a MathJax URL other than the default CDN, you have to set it on your account in the editor. If you write some exams that need an internal MathJax and others for the public, this is inconvenient. It's also hard to enforce with lots of authors.
The LTI provider could make a MathJax URL available to the exam iframe, in the same manner as the SCORM API. It would have to give a dictionary with URLs for different versions, to allow for breaking changes in MathJax, such as 2.x vs 3.x.