We hadn't thought about it honestly, mostly because we don't use MSSQL as much with Python. However, it shouldn't be too difficult to add support if we have the right drivers. I've created a ticket here to keep track of it - https://github.com/hashedin/squealy/issues/223.

there are several MSSQL drivers, but i could not understand from the project file structure support should be added to jinjasql or SQuealy ?

You'd add that to 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.