Hello All , 
I need to pass dynamic parameter to force:canvasapp , i tried the following code but actually it does not work : 

Controller  : here i retrieve some specific data from account standard controller , and i have a property named customerData in order to save a json formatted string .

public with sharing class CustomerDataController {
    public String customerData { get; set; }
  

    // Constructor method for the controller
    public CustomerDataController (ApexPages.StandardController stdController) {        
        Account account = (Account)stdController.getRecord();
        account = [SELECT Name, AccountNumber, BillingStreet, BillingCity, BillingState, BillingPostalCode, BillingCountry FROM Account WHERE Id = :account.Id][0];
        
        String accountNumber = account.AccountNumber == null ? '' : account.AccountNumber;
        String billingStreet = account.BillingStreet == null ? '' : account.BillingStreet;

        JSONGenerator gen = JSON.createGenerator(true);
        gen.writeStartObject();
        gen.writeStringField('AccountNumber', accountNumber );
        gen.writeStringField('AccountStreet', billingStreet);
        gen.writeEndObject();
		
        customerData = gen.getAsString();
    }
}

Lightening Component

<aura:component  implements ="force:lightningQuickAction">
     
  <force:canvasApp scrolling="auto"  applicationName="Development Canvas"  
                    developerName="Development_Canvas" 
                    width="1200" height="1200"
                    maxWidth="infinite" maxHeight="infinite"
              
                   parameters="{!customerData}"
                   />
</aura:component>

looking forward to your valuable response ,Thank you much !