How to change WMM priority with OpenWRT

i want to change the priority of WMM with OpenWRT by changing default values of AIFS, CWmin CWmax. I found a configuration with hostapd in this link, but went I have tried to write in the file hostapd.conf I found that it doesn't change any thing and all the configurations that I have done are not applied.
is there another way to change these parameters in OpenWRT?

As long as it isn't in the following file that converts uci config to hostapd's config, no.