vSphere Integrated Container Appliance does not have settings to use a proxy server for admiral and harbor connections.
Currently, VIC has proxy configurations for the VCHs only. Configure VCHs to Use Proxy Servers
The VIC Appliance containing the registry and container management portal does not have Proxy implementation for VIC version 1.0.x, 1.1.x, 1.2.x ,1.3.x, and 1.4.x.
For Specific proxy requirements or other feature requests please submit a VMware Feature Request