The Table Filter, Charts & Spreadsheets for Confluence app can be successfully migrated from Cloud to Cloud:
Space export/import (CSV)
Export your space in CSV format (see Atlassian documentation).
Import it into the destination Cloud site.
The imported space is added alongside existing data - no data is overwritten.
Site backup export/import
Export your full site backup (see Atlassian documentation).
Import it into the destination Cloud site.
The backup completely rewrites existing data, making the source and destination sites identical.
All the data related to the app - including table content, macros, and their settings - is stored within Confluence pages. During migration, this data is fully recreated on the destination site. No extra preparation is needed.
Don't forget to:
Install the Table Filter, Charts & Spreadsheets for Confluence app on the destination site.
Configure the app according to your needs.
Reapply the corresponding credentials on the destination site after migration, if you use Table from CSV or Table from JSON macros with external connections.