i have an slack app built in typescript, i’m trying to call a webhook trigger from a slash command the problem that i’m facing is that when i try to get a node from the body it is mapped as an empty string “”, anyone has faced the same?

const trigger: Trigger<typeof PrSendManuallyWorkflow.definition> = {
    type: TriggerTypes.Webhook,
    name: "Trigger when a new PR is received by slash command",
    workflow: `#/workflows/${PrSendManuallyWorkflow.definition.callback_id}`,
    inputs: {
        channel_id: {
            value: "{{data.channel_id}}"
        },
    },
};