Avg() column from Relationship

I'm looking to get the average sale price of each product sold and having some formatting issues. Read through this section in the docs and I'm stuck. Any help is appreciated!

TextColumn::make('saleItems_avg_price')->avg([ 
'saleItems' => fn (Builder $query) => $query->where('product_id', equalTo('id')),], 'price')

Schema::create('sale_items', function (Blueprint $table) {
$table->id();
$table->foreignId('sale_id')
                ->constrained('sales')
                ->cascadeOnDelete();
$table->foreignId('product_id')
                ->constrained('products')
                ->cascadeOnDelete();
$table->unsignedBigInteger('quantity');
$table->decimal('unit_price');
$table->decimal('price', 10, 2)
                ->nullable();
$table->timestamps();

 Schema::create('products', function (Blueprint $table) {
$table->id();
$table->string('name');
$table->string('sku')
                ->unique()
                ->nullable();
$table->longText('description')->nullable();
$table->unsignedBigInteger('quantity')->nullable();
$table->decimal('unit_cost', 10, 2)->nullable();
$table->boolean('is_visible')->default(false)->nullable();
$table->enum('type', ['flower', 'edible', 'etc'])->nullable();
$table->unsignedBigInteger('sold')->nullable();
$table->timestamps();
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