Rebuild Oracle text and retain existing parameter

Hi all,

Is there a way  rebuild  oracle context index and retain its existing parameter?

create table tmp (col1 varchar2(20)); 

create index idx  on tmp (col1)   INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS('SYNC (on commit)'); 

SELECT dbms_metadata.get_ddl('INDEX', 'IDX') FROM DUAL; 


  "  CREATE INDEX "IDX" ON "TMP" ("COL1")   INDEXTYPE IS "CTXSYS"."CONTEXT"  PARAMETERS ('SYNC (on commit)')"
  
alter index idx rebuild ;
    
SELECT dbms_metadata.get_ddl('INDEX', 'IDX') FROM DUAL; 

  CREATE INDEX "IAMAIN"."IDX" ON "IAMAIN"."TMP" ("COL1")   INDEXTYPE IS "CTXSYS"."CONTEXT" 

After rebuild,  parameter is NULLed out.