RTC+Jenkins: How to add new text field in jenkins UI if my claas is extending RtcExtensionProvider?

I am to new jenkins and devlopting one jenkins plugin by extending RtcExtensionProvider and its entry method is getComponentLoadRules (below is the code sample).
i want to add a custom text feild on jenkins UI, for that i have to extens Builder plugin which is not possible because i already extends my class with RtcExtensionProvider.
if i will create a new class XYZ extends Builder then also i am not able to call getComponentLoadRules method of class JenkinsLoad.

Is there any way to add custom fild on jenkins ui which below code possiblity?

@Extension
public class JenkinsLoad extends RtcExtensionProvider implements Serializable {
@Override
  public Map<String, String> getComponentLoadRules(String workspaceUUID, String workspaceName, String buildResultUUID,
      Map<String, String> componentInfo, String repoURL, String userId, String password, PrintStream logger)
      throws IOException, KeyManagementException, NoSuchAlgorithmException, CloneNotSupportedException {
      
      // rest implemention
      }
      }