How to update an item with a Multi-Field Reference?

Hello,

I’m trying to find the JSON structure to update an item having a multi-field reference.

I tried a PATCH with a few structures but no luck so far. I tried the following for instance.

“fieldData”:{
“FILTER LABEL”:[
{
“_id”:“ID REF ITEM 1”,
“slug”:“SLUG REF ITEM 1”
},
{
“_id”:“ID REF ITEM 2”,
“slug”:“SLUG REF ITEM 2”
}
]

I also tried this

“fieldData”:{
“FILTER LABEL”:[“ID REFERENCE ITEM 1”, “ID REFERENCE ITEM 2”]
}

Happy to look at any documentation about this topic, I’ve been searching but it looks dry.

Anyone can help?