How to apply json parser for particular grok parsed field and get new json parsed fields

Hi there!
I'd like to have already parsed field app_message additionally parsed with fields like language, companyEmail, country ,

Please suggest the proper way to do this.

    <filter kubernetes.**>
        #@id filter_parser
        @type parser
        key_name log
        reserve_data true
        reserve_time true
          @type grok
          grok_failure_key grokfailure
            pattern %{TIMESTAMP_ISO8601:app_timestamp}" level\=%{DATA:app_log_level} msg\=%{GREEDYDATA: **app_message** }

app_message content:

Create data draft in db: DatasetDraftVO(id=d57f73fc547f, datasetVO=null, entityId=legalEntityId, datasetVersion=1, data=VerifiableCredential(contexts=[,], id=le_cd_1, types=[VerifiableCredential,credentialSubject={"corporateData":{"bylaws":{"value":""}," **language** ":{"value":"English"}," **legalForm** ":{"value":"Private limited company"}," **legalName** ":{"value":"CompanyName1"}," **companyEmail** ":{"value":"[](javascript:)"}," **companyWebsite** ":{"value":""}," **country** ":{"value":"France"}," **mailbox** ":{"value":"444"}," **zipCode** ":{"value":"2000"}} proofs=null), **draftStatus** =DRAFT)

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