How do I export my LTM redirect policy to another f5 LTM?

You can always export your entire config from one BIG-IP system to an SCF file, edit the SCF to eliminate everything except the Local Traffic Policies (it's a text file), then merge the configuration data into the other BIG-IP system. See K81271448: Merging BIG-IP configuration objects into the running configuration using tmsh for more information on how to do this.