SENS_FLOW_* Parameters and No Distance Values with Holybro HFlow (DroneCAN)

I am using Holybro HFlow at CAN port with firmware v1.15.2. HFlow configuration is given on their site HFlow-configuration. After enabling CAN-BUS I can not see following parameters

SENS_FLOW_MINHGT 
SENS_FLOW_MAXHGT
SENS_FLOW_MAXR

in my following parameters. The distance value in the MAVLink inspector is also is not giving
values