[ROS 2] layered yaml config file

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Hi, I came across an example of a yaml file:

talker_ns:
    talker:
        ros__parameters:
            some_int: 42
            a_string: "Hello world"
            more_params:
                some_int2: 24
                some_doubles : [3.14, 2.718]

I have no problems with reading the some_int and a_string like this:

get_parameter_or("some_int", some_int, int(0));

However, I can't wrap my head around how to read some_int2. I tried doing it by inserting the parameter category get_parameter_or("more_params/some_int2", some_int2, int(0)); but it doesn't work.

I'm using rclcpp_lifecycle node (I don't know if it matters).

What is the right way to do it?