sqlite alter table add MULTIPLE columns in a single statement

The only thing so far possible that I use is

BEGIN TRANSACTION;
ALTER TABLE tblName ADD ColumnNameA TEXT DEFAULT '';
ALTER TABLE tblName ADD ColumnNameB TEXT DEFAULT '';
ALTER TABLE tblName ADD ColumnNameC TEXT DEFAULT '';
COMMIT

Note that there are ; on purpose to make the query be read as multiple lines.

Then I run this query and get multiple columns added in on run... So no not in one line, but yes in one query its possible.

No, you have to add them one at a time. See the syntax diagram at the top of SQLite's ALTER TABLE documentation:

There's no loop in the ADD branch so no repetition is allowed.