Tell me by luci-app-https-dns-proxy dscp_codepoint

Hi all
I still did not understand whether the DSCP_codepoint function works or not or is it necessary to install something additionally ?
I want the priority of the luci-app-https-dns-proxy traffic is higher than everything else and set the value of 63, but did not understand whether this function works or not

I just asked why, maybe for the dscp_codepoint function to work, you need to install an additional QoS package or not ?