add default value resolver

src/Fields/Field.php

@@ -41,6 +41,11 @@ abstract class Field implements Arrayable, JsonSerializable
      */
     protected ?Closure $formatResolver = null;
 
+    /**
+     * The default value resolver callback.
+     */
+    protected ?Closure $defaultValueResolver = null;
+
     /**
      * The value resolver callback.
      */
@@ -342,6 +347,20 @@ public function resolveSearchQuery(Request $request, Builder $query, mixed $valu
             : call_user_func_array($this->searchQueryResolver, [$request, $query, $value]);
     }
 
+    /**
+     * Set the default value resolver.
+     */
+    public function default(mixed $value): static
+    {
+        if (! $value instanceof Closure) {
+            $value = fn (): mixed => $value;
+        }
+
+        $this->defaultValueResolver = $value;
+
+        return $this;
+    }
+
     /**
      * Set the value resolver.
      */
@@ -363,6 +382,10 @@ public function resolveValue(Request $request, Model $model): mixed
 
         $value = $this->getValue($model);
 
+        if (! is_null($this->defaultValueResolver)) {
+            $value = call_user_func_array($this->defaultValueResolver, [$request, $model]);
+        }
+
         if (is_null($this->valueResolver)) {
             return $value;
         }