Not able to evaluate CustomAction

[anant-xpc]

I'm trying to define a rule with a Custom Action that evaluates an input field in the json and performs some operation on that field.

Here's an example of what I'm trying to do:
Given this input json

{ "Data": { "BaseData": { "Content": [ { "Id": "product001/sku111/id009", "TargetItemId": "BuyButton" } ] } } }

I want to transform the Id field Data.BaseData.Content[0].Id to just contain product001 by splitting the string.

Here's what my rule looks like:
{ "RuleName": "SetProductId", "SuccessEvent": "GiftPurchase", "ErrorMessage": "Failed to set purchase flow to Gift.", "ErrorType": "Error", "RuleExpressionType": "LambdaExpression", "Expression": "1 == 1", "Actions": { "OnSuccess": { "Name": "CustomAction", "Context": { "customContextInput": "input1.Data.BaseData.Content[0].Id" } } } }

Here's the Custom Action defined by me:

`public class CustomAction : ActionBase
{
private readonly RuleExpressionParser _ruleExpressionParser;

public CustomAction()
{
    _ruleExpressionParser = new RuleExpressionParser();
}

public override ValueTask<object> Run(ActionContext context, RuleParameter[] ruleParameters)
{
    string customInput = context.GetContext<string>("customContextInput");

    string input = _ruleExpressionParser.Evaluate<string>(customInput, ruleParameters);

    // Add your custom logic here and return a ValueTask
    string[] parts = input.Split(new[] { "/" }, StringSplitOptions.None);
    return new ValueTask<object>(parts[0].Length > 0 ? parts[0] : input);
}

}`

When running the rule evaluation I get the following error:

Expression of type 'System.Object' cannot be used for return type 'System.String'

[suntang27]

Why not create public property inside input1 class object to retrieve the Id?

[anant-xpc]

I can't because that's how the input json is structured.