How can I pass params to query in SQL JDBCRead?

I'm working in a opl project. In my .dat file I have

```
px = 20
JDBCConnection in("jdbc:sqlite:my_database.db", "");
my_param from JDBCRead(in, "SELECT COL FROM TABLE WHERE COL2 <= 20");
```
I need:
```
my_param from JDBCRead(in, "SELECT COL FROM TABLE WHERE COL2 <= :px");
```

All variables are defined correctly in .mod file