Hey @Jarvis_Engineer!
Here are our docs on editable table columns, though I assume you've seen this already:
https://docs.retool.com/docs/build-tables#editable-table-columns
For Firestore specfically, do you have a screenshot of your current query? Are you passing in your table's recordUpdate values in or a selectedSourceRow value?
Here's an example of a user passing in JSON to Firestore!
http://community.retool.com/t/sending-json-to-a-firestore-db/13379