Dynamics 365 Set a Lookup Field Using JavaScript from another lookup selection change

 In my case, I will select a contact from lookup and it will fill the account lookup field.

 function OnContactChange(executionContext) {  
      var formContext = executionContext.getFormContext();  
      if (formContext.getAttribute("parentcontactid").getValue() != null) {  
             var CustomerId = formContext.getAttribute("parentcontactid").getValue()[0].id.slice(1, -1);  
       var CustomerName = formContext.getAttribute("parentcontactid").getValue()[0].name;  
       var CustomerType = formContext.getAttribute("parentcontactid").getValue()[0].entityType;              
             // Call contact API  
             Xrm.WebApi.retrieveRecord("contact", CustomerId, "?$select=_parentcustomerid_value").then(  
                     function success(contactresult) {  
                          // Call Account  
                           Xrm.WebApi.retrieveRecord("account", contactresult._parentcustomerid_value, "?$select=accountid,name").then(  
                               function success(result) {                                      
                                     var setaccountlookupData = new Array();  
                                     setaccountlookupData[0] = new Object();  
                                     setaccountlookupData[0].id = result.accountid;  
                                     setaccountlookupData[0].name = result.name;  
                                     setaccountlookupData[0].entityType = 'account';                                       
                                     console.log(setaccountlookupData);       
                                     // Set Account value  
                                     formContext.getAttribute("parentaccountid").setValue(setaccountlookupData);  
                               },  
                               function (error) {  
                                    console.log(error.message);                            
                               }  
                          );   
                     },  
                     function (error) {  
                          console.log(error.message);                            
                     }  
                );  
     }  
 }