Change the formKey of a user task on the task scope in task listener in camunda 7.19

Camunda 7 Topics Discussion & Questions
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Hi all. I want to crate a script in groovy format in a task listener that attaches to a user task.I used {{some_name}} as a logical placeholder in formKey in bpmn. I want to replace the placeholder at the runtime with the actual value that comes from an api. for example the value is https://xyz.com
I wrote the script like this :

import groovy.json.JsonSlurper

import java.util.regex.Matcher
import java.util.regex.Pattern

def formService = task.execution.getProcessEngineServices().getFormService()
String processDefinitionId = task.execution.getProcessDefinitionId()
String taskDefinitionKey = task.getTaskDefinitionKey()
String formKey = formService.getTaskFormKey(processDefinitionId, taskDefinitionKey)

Pattern placeholderPattern = Pattern.compile("\\{\\{(.*?)}}");
Matcher matcher = placeholderPattern.matcher(formKey);
StringBuilder result = new StringBuilder();
List<Object> results = new ArrayList<>();
if (matcher.find()) {
    String matchName = matcher.group(1).trim();
    matcher.appendReplacement(result, matchName);
    results.add(matchName);
}
def variableName = matcher.appendTail(result);

def client = new URL("https://name.com/d/api/v1.0/systemVariable/variable?vn=%s".formatted(variableName));
def headers = ['Authorization': "Bearer token value"]
HttpURLConnection connection = (HttpURLConnection) client.openConnection()
connection.setRequestMethod('GET')
headers.each { key, value ->
    connection.setRequestProperty(key, value)
    connection.content
    def responseCode = connection.getResponseCode()
    if (responseCode == 200) {
        def responseStream = connection.getInputStream()
        def responseText = responseStream.getText()
        def jsonResponse = new JsonSlurper().parseText(responseText)
        if (jsonResponse["value"] != null) {
            def expressionManager = task.execution.getProcessEngineServices()
                    .getProcessEngineConfiguration()
                    .getExpressionManager()
            def formKeyExpression = expressionManager.createExpression(jsonResponse["value"].toString())
            task.getTaskDefinition().setFormKey(formKeyExpression);
        }
    }
}
//}

There is a problem with this line of script: task.getTaskDefinition().setFormKey(formKeyExpression)
that changes the form key for entire definition which remove the {{some_name}} for next instance will run. How to do this? I want to change the formKey only for this instance not entire instances.