Is there any possibility to change created by attribute in GCM Component using APIs?

No, that is not possible. As Ralph commented above, dcterms:created is intentionally considered a read-only attribute and cannot be modified with an HTTP PUT. This is considered best practice for audit reasons.The resource shape for a global configuration defines the dcterms:created property as:

      oslc:property
              [ a       oslc:Property ;
                oslc:name "Date Created" ;
                oslc:occurs oslc:Exactly-one ;
                oslc:propertyDefinition
                        dcterms:created ;
                oslc:queryable "true"^^xsd:boolean ;
                oslc:readOnly "true"^^xsd:boolean ;
                oslc:valueType xsd:dateTime ;
                dcterms:title "Date Created"^^rdf:XMLLiteral

The same applies to dcterms:creator :

      oslc:property
              [ a       oslc:Property ;
                oslc:name "Creator" ;
                oslc:occurs oslc:Exactly-one ;
                oslc:propertyDefinition
                        dcterms:creator ;
                oslc:queryable "true"^^xsd:boolean ;
                oslc:range foaf:Person ;
                oslc:readOnly "true"^^xsd:boolean ;
                oslc:valueType oslc:Resource ;
                dcterms:title "Creator"^^rdf:XMLLiteral
              ] ;

 In my mind, it should not be possible to modify data such as CreatedBy, Creation Date, ModifiedBy, Modified etc. this would clash with Audit capability and truth of the data. I have not been able to modify those values in any Jazz application I have tried with whatever API I tried. I believe I have seen EWM/RTC integrations being able to set these values for the initial creation, but I do not know which API they used. There might be a special hidden API that allows this. Once created, these values should not be modifiable.