Within a Rails project, use the command Show Rails Schema to open a new activitybar panel with all the DB tables in the db/schema.rb file.
If the command is triggered from a Rails Model, it will automatically expand that especific table in the tree view showing the related column's names and types.
From the list of DB tables on the Rails Schema activitybar, on hover, there's a Open in Schema button that will open the db/schema.rb file and center the block related to that specific table.