Best way to perform dynamic subquery in MS Reporting Services?

select *,
 (select count(*) from tbl2 t2 where t2.tbl1ID = t1.tbl1ID) as cnt
from tbl1 t1

declare @tbl1 table
(
 tbl1ID int,
 prop1 varchar(1),
 prop2 varchar(2)
)

declare @tbl2 table
(
 tbl2ID int,
 tbl1ID int
)

select *,
 (select count(*) from @tbl2 t2 where t2.tbl1ID = t1.tbl1ID) as cnt
from @tbl1 t1

select t1.ID, t1.property1, t1.property2, t2.somecol, t2.someothercol
from table t1 left join anothertable t2 on t1.ID = t2.ID