I want to display on my case layout other open Cases related to Account from case.
I have got a VFP to display them on my Account page layout but I can't display them on my Case layout.
Any ideas what to do? I could get those records without VF with trigger on my Cases but i try to find different way to do that.

VFP code:

    <apex:page standardController="Account" extensions="contrller">
    
      <apex:form >
        <apex:pageblock >
           <apex:pageBlockTable value="{!relatedCases}" var="val">
             <apex:facet name="header"><b>Open Customer Service Cases</b></apex:facet>       
             <apex:column value="{!val.CaseNumber}"/>         
             <apex:column value="{!val.Status}"/>
             <apex:column value="{!val.RecordTypeId}"/>
             
           </apex:pageBlockTable> 
        </apex:pageblock>
      </apex:form>
    </apex:page>
with controller:

    public with sharing class contrller {
    Public id Current_Acc_Id;
    
        public contrller(ApexPages.StandardController controller) {
        Current_Acc_Id = controller.getRecord().id;
        }
    
        public List<Case> getrelatedCases(){
            List <case> conList = New List<Case>();
            for(Account acc:[select (select status, CaseNumber, RecordTypeId from cases WHERE RecordTypeId = '01220000000QawC' AND Status != 'Closed') from account where id=:Current_Acc_Id]){
               for(case con:acc.cases)
                   conList.add(con); 
            }
            return conList;
        }
    }