How Haetoas conform add Links - spring-rest

Question

I want to add links to some related entities and collection, without all property data in one response, only the Link.
For unterstanding I structure the Question in some parts
Simple example of data Model
Order
Order->AddressFrom (Entity)
Order->PackageItems (Collection)
Which is the wright HAETOAS way to generate links or how to name entities in response.
First question: How to link address, double in entity name and links part and how to nam?
{
"_embedded":{
"orders":[
{
"id":"id",
"addressLinkFrom":{
"href":"link"
},
"_links":{
"self":{
"href":"link"
},
"addressFrom":{
"href":"d"
}
}
}
]
}
}
or
"addressFrom":{
"href":"link"
},
"_links":{
...
}
or
or
"addressFrom":{
"self":{
"href":"link"
}
},
"_links":{
...
}
Second: How to link collection to specific and not all entities
{
"_embedded":{
"orders":[
{
"id":"id",
"packageItemIds":[
{
"href":"link"
},
{
"href":"link"
}
]
}
]
}
}
or
"packageItemIds":[
{
"self:"{
"href":"link"
}
}]
Third: How is the right format for (update, post), which I have to parse, like the address, where I'm sending the ID or like the packageItems, where I sending the link.
{
"id":"id",
"addressFrom":{
"id":"12345"
}
"packageItems":[
{
"href":"link"
},
{
"href":"link"
}
]
}
For your information, as frontend Client I'm using lagoshny /
ngx-hateoas-client,
when someone has their extra information beside the HAETOAS standard, how is the best way, please tell me.
Thanks for your help.I want to add links to some related entities and collection, without all data in one response.