This area is almost straight clay, I’ve gotten the grass patch to slowly expand, but what is the best method to drain this? It takes days/weeks to dry up after heavy rain.

I looked up French drains— lay pea gravel in a trench then run perforated pipe to the ditch with more pea gravel on top then burry it? Unsure if water will seep into the clay enough for that to work or if there’s a better way.