Table as argument in postgres function

I'm trying to convert SAP Hana procedures in PG and i'm not able to handle below scenario in Postgres 11

Scenario: I want to pass a table (Multiple rows) to function and use it inside as a temp table. 

Sample Code:

create a table tbl_id (id int, name character varying (10));

insert few rows to tbl_id;

create a function myfun (in tt_table <How to define a table type here> )

begin

return setof table(few columns)

begin 

as 

select id,name into lv_var1,lv_var2;

from tt_table --> Want to use the input table 

where id = <some value>;

return query 

select *

from tbl2 where id in (select id from tt_table); --> Want to use the input table 

end;

I don't want to go with dynamic sql, is there any other way to declare a table as input argument and use it a normal temp table inside the function body? 

--> Function invocation issue:

select * from myfun(tbl_id);

How to invoke a function by passing a table as argument?