Chaining Wire API calls LWC SalesForce

You can indirectly chain your wire calls in LWC using the $ operator in the input param of the call

First call -

@wire(getRecord, {recordId: '$recordId', fields: FIELDS1})
GetParentRecordId({error, data}) {
  if (data) {
    this.parentId = data.fields.ObjectApiName1.value;
  } else if (error) {
    console.log('error2 ', error)
  }
}

Second Call -

@wire(getRecord, {recordId: '$parentId', fields: FIELDS2})
GetGrandParentRecordId({error, data}) {
  if (data) {
    this.GrandParentId = data.fields.ObjectApiName2.value;
  } else if (error) {
    console.log('error2 ', error)
  }
}