Grouping found set Property into spec file

hello

To group some property into spec file as show into code attached image, like masterDetail section having childfoundset and childcolumns, can you please guild me how to set foundset into childcolumn–>dataprovider section (highlighted into red) means require syntax for this case

“model”:
{
“allowExportData”: { “type”: “boolean”,“default”:true},
“masterDetail”:
{
“droppable”: false,
“type”: “MasterDetail”,
“pushToServer”: “shallow”,
“elementConfig”:
{
“pushToServer”: “shallow”
}
}
},
“types”:
{
“MasterDetail”:
{
“enabled”:{“type”:“boolean”,“default”:false},
“relationName”:{“type”:“relation”},
“childfoundset”: { “type”: “foundset”, “pushToServer”: “allow”,“dynamicDataproviders”:true,“provideColumnFormats”:true, “sendSelectionViewportInitially”: true},
“childcolumns”: { “type”: “childcolumn”, “droppable”: true, “pushToServer”: “shallow”, “elementConfig”: { “pushToServer”: “shallow” } },

},
“childcolumn”:
{
“dataprovider”: { “type”: “dataprovider”, “forFoundset”: “childfoundset” },
“headerText”: { “type”: “tagstring”, “initialValue”: “header”, “tags”: { “showInOutlineView”: true } },
“width”: { “type”: “string” },
“fsDpName”:{“type”:“string”},
“visible”:{“type”:“boolean”,“default”:true}
},
},
Thank you

This is not supported in 8.1.x (so “forFoundset” or “for” always look on the root level of properties in the web component - at runtime).
In 8.2 what you want to do should work. There it will look for property dependencies in all parent nested custom objects (due to some cases that are in-progress atm).