First take on recipient node

numberRecipient.html

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+<script type="text/javascript">
+    RED.nodes.registerType('number-recipient', {
+        category: 'config',
+        defaults: {
+            name: {value: ""},
+            number: {value: "", required: true}
+        },
+        label: function() {
+            return this.name || this.number || "Number Recipient";
+        }
+    });
+</script>
+
+<script type="text/html" data-template-name="number-recipient">
+    <div class="form-row">
+        <label for="node-config-input-name"><i class="fa fa-tag"></i> Name</label>
+        <input type="text" id="node-config-input-name" placeholder="Name">
+    </div>
+    <div class="form-row">
+        <label for="node-config-input-number"><i class="fa fa-phone"></i> Phone Number</label>
+        <input type="text" id="node-config-input-number" placeholder="+1234567890">
+    </div>
+    <div class="form-tips">
+        <strong>Tip:</strong> Enter the phone number with or without country code (e.g., +1234567890 or 1234567890).
+    </div>
+</script>
+
+<script type="text/html" data-help-name="number-recipient">
+    <p>Configuration node for a WhatsApp chat recipient.</p>
+    <h3>Details</h3>
+    <p>This configuration node stores a phone number that can be reused across multiple chat output nodes.</p>
+    <p>The phone number can be overridden at runtime by setting <code>msg.toNumber</code> in the flow.</p>
+    <h3>Configuration</h3>
+    <dl class="message-properties">
+        <dt>Name <span class="property-type">string</span></dt>
+        <dd>A friendly name to identify this recipient (optional).</dd>
+        <dt>Phone Number <span class="property-type">string</span></dt>
+        <dd>The WhatsApp phone number. Can include country code with or without + prefix.</dd>
+    </dl>
+</script>