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

 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.

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
              ] ;