Change DSCP Value on Layer2 N5k

So I been googling for two days and haven't found a clear answer. I find things that are way more complex than what I need. I am not a QOS guru.

Scenario: Traffic comes in port 1 from a router we do not control. When it comes in it will then switch to port 2 to one of our devices. When it arrives on our device it shows DSCP is 0. I need to have it changed to anything besides 0, but lets say 46/EF cause its voice. I control the switch, Nexus5548 running 5.1.3.N2.1b.

I have tried numerous ways but nothing is working for me. One of my limits is I can't do a service policy out put on port 2. This would lead me to apply in on port 1 (router). Its not that it is not working, its more that it will not take a full config of when I try. SO I know I am missing something. Here are some resources I been using:

https://www.netcraftsmen.com/testing-egress-marking-in-nx-os-qos/

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/qos/513_n2_1/b_Cisco_Nexus_5000_QoS_Config_Guide_513_N2_1/b_Cisco_Nexus_5000_QoS_Config_Guide_513_N2_1_chapter_0111.html

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/qos/513_n2_1/b_Cisco_Nexus_5000_QoS_Config_Guide_513_N2_1/b_Cisco_Nexus_5000_QoS_Config_Guide_513_N2_1_chapter_0100.html