Ok, it has been resolved quite easy.
{
"jsonrpc": "2.0",
"method": "cmdb.category.save",
"params": {
"object": {{objectID}},
"apikey": {{IdoitApiKey}},
"category": "C__CATG__GLOBAL",
"data": {
"cmdb_status": 10
}
},
"id": 1
}