That’s right @alwaysblank, we are using “roots/acorn”: “^3.1” in the theme.
You mentioned that I can try unhooking Acorn from that filter and provided a link to the SageServiceProvider class.
I managed to prevent the boot method from running when the route /jobrelay/jobfeed/ is called in the ThemeServiceProvider class and it is now returning JSON data.
Thanks for pointing me in the right direction.