At the moment Firestore admin panel doesn't allow to export/import data from their DB. These scripts allow you to load data on your machine, edit and bring it back. See examples to learn how it works.
npm run firestore:copy sourcePath fileToSave.json
Save a collection
npm run firestore:copy partners/1/items general-partners.json
Save a document
npm run firestore:copy partners/1/items/000 gdg-lviv-partner.json
npm run firestore:copy fileToLoad.json destinationPath
Load to collection
npm run firestore:copy general-partners.json partners/1/items
Load a document
npm run firestore:copy gdg-lviv-partner.json partners/1/items/000
npm run firestore:copy sourcePath destinationPath
Copy a collection
npm run firestore:copy speakers backups/08-07-2018/speakers
Copy a document
npm run firestore:copy speakers/yonatan_levin backups/08-07-2018/speakers/yonatan_levin