The only example of how to use it is an animation that is just impossible to read :(

Here are the examples in the live demo[1]:

    %LOAD sqlite3 db=chinook.db timeout=2 shared_cache=true
    %XVEGA_PLOT X_FIELD EmployeeId Y_FIELD ReportsTo BIN TRUE MARK square WIDTH 100 HEIGHT 200 <> SELECT EmployeeId, ReportsTo FROM employees
    %XVEGA_PLOT X_FIELD EmployeeId Y_FIELD ReportsTo BIN MAXBINS 3 MARK bar COLOR red WIDTH 200 HEIGHT 200 <> SELECT EmployeeId, ReportsTo FROM employees
    %XVEGA_PLOT X_FIELD EmployeeId Y_FIELD ReportsTo TYPE ordinal MARK bar COLOR green WIDTH 200 HEIGHT 200 <> SELECT EmployeeId, ReportsTo FROM employees
    %XVEGA_PLOT X_FIELD Name TYPE nominal Y_FIELD ArtistId BIN MAXBINS 1 MARK line COLOR purple WIDTH 200 HEIGHT 200 <> SELECT Name, ArtistId FROM artists LIMIT 10
    %XVEGA_PLOT X_FIELD EmployeeId GRID false Y_FIELD ReportsTo MARK area COLOR pink WIDTH 200 HEIGHT 200 <> SELECT EmployeeId, ReportsTo FROM employees

[1] https://hub.gke2.mybinder.org/user/jupyter-xeus-xeus-sql-x64...