Custom Connector UI default view

Question

Below is the snippet of simplified Custom Connector code.

section Simple;

[DataSource.Kind="Simple", Publish="Simple.Publish"]
shared Simple.Data = Value.ReplaceType(SimpleImpl,SimpleType);
Parameters = type [
    optional #"First parameter" = number,
    optional #"Second parameter"   = date,
    optional #"Third parameter"   = (type logical meta [
        Documentation.AllowedValues = {true,false}
    ])
];

SimpleType = type function (
    #"First parameter" as text,
    optional #"The Parameter" as Parameters
) 
as table meta [
    Documentation.LongDescription = "Simple",
    Documentation.Name = "Simple"
];
SimpleImpl = (
    #"Required parameter" as text,
    optional #"The Parameter" as record) =>
    let

It has one required and one optional parameter (which is a record) consisting of three “sub-parameters”.

The UI looks like:

Preferable would be – since second parameter is optional – that UI opens initially like below (not the one above):

In this case the user who is interested in providing values for First, Second, and Third parameter would click on the arrow.

Is it possible? Any help on how to set it up will be greatly appreciated!

I tried to look through documentation - there is no any mentioning of "Record" type parameters, least of default view setup.