Unique count metric for array of fields

After aggregation I have documents with below structure in a bucket.
{ … array: [ { … }, { … }, { key: value } ] }
Can I somehow apply unique count metric for key field? Thanks.
P.S
Does this limitation mean I can’t do aggregation or perform metrics on key fields/values like below ?
{ … array: [ { … }, { … }, { key: value } ] }
{ … array: [ ‘key1’, ’ key2’ ] }

Unfortunately the format of your data is incompatible with Kibana’s ability to run unique count metrics. Could you restructure your data so that it’s not inside an array?

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