there are several MSSQL drivers, but i could not understand from the project file structure support should be added to jinjasql or SQuealy ?
JinjaSQL simply generates a SQL query with an associated array of parameters. It isn't even aware of the SQL query that's written. JinjaSQL would work just fine with any database.
Squealy is a django project, so if you can get the right database driver configured and installed - in theory, squealy would just work fine with MSSQL. After all, the user is writing the query, so squealy doesn't care much about the underlying differences in the way SQL is written.