Grouping columns on a table or export CSV for all tables in dashboard automatically (script with cron)

I would like to make a table grouping all the columns of the other tables created in my dashboard or if it’s not possible, I want to export CSV file for all tables who is contained in my dashboard automatically with cron and script.

For to explain, i have 4 tables with 2 columns( metric and Current).
The metric are the same for 4 table.
Tables are in time series aggreggation.
I want to have the first column to “metric” and next columns “Current” (4) with columns present in 4 tables.

Thanks for your help.