[BUG] ASPNETCORE Collection And ICollection - Missing using System.Collections.ObjectModel;

using 4.0.2
generating for aspnetcore
below are my settings

    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>4.0.2</version>
    <executions>
      <execution>
        <phase>process-sources</phase>
        <goals>
          <goal>generate</goal>
        </goals>
        <configuration>
          <inputSpec>${project.namespace}/bin/swagger/swagger.yaml</inputSpec>
          <generatorName>aspnetcore</generatorName>
          <output>./</output>
          <generateApiTests>false</generateApiTests>
          <generateModelTests>false</generateModelTests>
          <generateApiDocumentation>false</generateApiDocumentation>
          <generateModelDocumentation>false</generateModelDocumentation>
          <skipValidateSpec>true</skipValidateSpec>
          <apiPackage>${project.namespace}.Api</apiPackage>
          <modelPackage>${project.namespace}.Model</modelPackage>
          <configOptions>
              <returnICollection>true</returnICollection>
              <useCollection>true</useCollection>
              <generateBody>false</generateBody>
              <operationResultTask>true</operationResultTask>
              <classModifier>abstract</classModifier>
              <operationModifier>abstract</operationModifier>
              <sourceFolder>./</sourceFolder>
              <packageName>${project.namespace}</packageName>
          </configOptions>
        </configuration>
      </execution>
    </executions>
  </plugin>

2 issues found

1. useCollection property works but missing the using System.Collections.ObjectModel;
2. returnICollection doesn't appear to work it still generates as Collection not ICollection

expect the using System.Collections.ObjectModel; statement to also be generated and placed at the top of class file

other nice to have please additional options if possible

• Dictionary as IDictionary
• List as IList

Reproduce the issue with the provided Maven plugin configuration and the aspnetcore generator, using the useCollection and returnICollection options. Inspect the generated class file and compare its collection types and using statements with the requested output. Done means the appropriate collection imports and configured interface types are generated consistently.