GitLab On-Demand Repository Config

I have been playing around with GitLab DAST scanning and have ran into some roadblocks when trying to find an answer. I have been trying to configure a DAST On-Demand scan but it has failed every time due to it using an incorrect image registry. I have tried to search far and wide, but cannot seem to find any information on editing what image registry the DAST job uses while running an On-Demand scan. We were successful in running an automatic scan due to being able to update the registry within the .yml file.

Is this feature available currently? It seems that there are not many fields that are able to be edited while configuring the On-Demand scan through the UI. Are there anyways to override the image repository like there is with an automatic scan?