After flashing Drive PX2 to 1.2.400 , how to record more than 1 camera per channel?

After flashing our PX2 to DW 1.2.400, the input format for recorder has changed.
The new format can be found at /usr/local/driveworks/tools/capture/configs/hyperion7_1/release.json
and defines 2 cameras, one per channel, second one in slave mode.

{
"rig": {
    "sensors": [
        {
            "name": "camera:front:center:120fov",
            "nominalSensor2Rig": {
                "quaternion": [...],
                "t": [...]
            },
            "parameter": "camera-type=ar0231-rccb-bae-sf3324
            ,csi-port=a,camera-count=1,format=h264
            ,output-format=yuv,fifo-size=12,file-buffer-size=4194304",
            "properties": {
                "Model": "ftheta",
                "bw-poly": "0.0 0.00102669443003833 3.77865596590254e-08 -2.1812513600894e-11 4.76916107246175e-14",
                "cx": "960",
                "cy": "604",
                "height": "1208",
                "width": "1920"
            },
            "protocol": "camera.gmsl",
            "sensor2Rig": {
                "quaternion": [...],
                "t": [...]
            }
        },
        {
            "name": "camera:front:center:60fov",
            "nominalSensor2Rig": {
                "quaternion": [...],
                "t": [...]
            },
            "parameter": "camera-type=ar0231-rccb-bae-sf3325,csi-port=c
           ,camera-count=1,format=h264,output-format=yuv
           ,fifo-size=12,slave=1,file-buffer-size=4194304",
            "properties": {
                "Model": "ftheta",
                "bw-poly": "0.0 0.000545421498827636 -1.6216719633103e-10 -4.64720492990289e-12 2.85224527762934e-16",
                "cx": "960",
                "cy": "604",
                "height": "1208",
                "width": "1920"
            },
            "protocol": "camera.gmsl",
            "sensor2Rig": {
                "quaternion": [...],
                "t": [...]
            }
        },

Since before PX2 update I was able to record 8 cams ( 4 on port ab, 4 on port cd )
I wonder, how the rig configuration has to be changed in order to record the 8 cameras again?
Thanks for your support

Since I cannot find any documentation about, any clarification would be appreciated.

Any support on this would be very helpful. Thanks.

Dear @hermann.fuerntratt ,
Could you check /usr/local/driveworks/doc/nvdwx_html/dwx_recording_devguide_basic_recording.html. You could see configuration example of adding 3 cameras (2 from a and 1 from c). Let us know the feedback