Outports and other model elements can be programmatically configured through the interface for code mappings.
You can refer to this linked documentation which provides code to configure outputs. Here is a sample code you can use:
set_param(model,'DefaultParameterBehavior','Tunable');
codeMappings = coder.mapping.utils.create(model);
outports = find(codeMappings, 'Outports');
setOutport(codeMappings,outports(1), property, valueToSet);
For further information, the documentations for coder.mapping.api.CodeMapping and AUTOSAR Programmatic Interfaces outline related functions.
