negative sensitivity on gas sensor from alphasense

I am implementing a gas concentration measurement system based on boards CN0429 and ADICUP3029, software from GitHUB ADuCM3029_demo_cn0428_cn0429. When I look for the alphasense manufacturer's data for its NO2 and O3 sensors (NO2-A43F and OX-A431, both 4 electrodes), it shows me that their sensitivity is negative, however, through CLI only positive values can be entered. Does this mean that I must modify the firmware of the CN0429?

Similarly, the Ozone sensor provides two sensitivities since its output is a sum of O3 + NO2, how this case could be considered through the CLI.