How do I Filter a Map in CEL?

[stack123-afk]

Say I have the following JSON:

"data": {
   "x":  {
      "name": "foo"
      "value": "afoo"
    },

   "y": {
      "name": "dsdas"
      "value": "sda"
    },
    ....
}

I want to select out the item data where name == "foo", i.e. want a CEL expression that prints out

   "x":  {
      "name": "foo"
      "value": "afoo"
    },

I attempted to use 'data.filter(x, x.name=="foo")' but this does not work as data is not a list, any alternatives?

Note: the children of data are variable with keys unknown