1：demo

import com.fasterxml.jackson.databind.ObjectMapper;

public class Main {
    public static void main(String[] args) throws Exception {
        String aa = "[[\"53\",\"1732308576065851394\"],[\"53\",\"29\"],[\"53\",\"70\"]]";
        
        ObjectMapper objectMapper = new ObjectMapper();
        String[][] array = objectMapper.readValue(aa, String[][].class);
        
        System.out.println(Arrays.deepToString(array));
    }
}

2：pom.xml

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.0</version>
</dependency>