SQM settings when there are multiple DHCPs and NAT is not required

Hi!
I have a question about setting up SQM when there are multiple DHCPs and NAT is not needed.

<1> WAN Rounter (192.168.1.1) DHCP
|
<2> openwrt Router (192.168.1.2) DHCP
|
Switch
|
PC (192.168.1.3)

I want to pass packets from a PC to <2> and control the bandwidth with sqm.
Also, I would like to force the PC to use the DHCP of <2> with the DHCP of <1> enabled.

Is it possible to use it as above?
I would appreciate it if you could give me some advice without any knowledge of networks.