Yes, you need to edit JEVOIS:/config/videomappings.cfg and uncomment or create a mapping that uses the PassThrough or Convert module. There are samples at the beginning of the file. You want to use as USB out mode the mode that your module running on host will request as camera mode. You may have to disable some other modes in the file with same output format.
So if your host wants 640x480 YUYV then add
YUYV 640 480 30.0 YUYV 640 480 30.0 JeVois PassThrough
More info is here about host vs platform and dumb camera mode: http://jevois.org/doc/Concepts.html
And for mappings http://jevois.org/doc/UserModes.html