To make the filling: In a mixing bowl, add the chopped shrimp, salt, white pepper, oyster sauce, sesame oil, and grated ginger. Mix until well combined. Add the scallions and mix again.
To assemble the soup dumpling lasagnas: In each ramekin or heatproof bowl, add some shrimp filling, then place a dumpling wrapper on top. Repeat with more shrimp filling and another wrapper, adding more or fewer layers depending on the depth of your bowls. Pour a little chicken stock or seafood stock around the filling, then finish with one more dumpling wrapper on top. Repeat with the remaining bowls.
To steam the soup dumpling lasagnas: Over high heat, bring water to a boil. Place the ramekins on a steaming rack, carefully set them over the boiling water, and cover. Steam over high heat for about 10 minutes, or until the shrimp is completely cooked through and the center of the filling reaches at least 145°F (63°C).
To serve: Carefully remove the ramekins from the steamer. Top with scallions and, if desired, drizzle with chili oil, soy sauce, and Chinkiang vinegar. Serve immediately.