SQL API -- named arguments

The API supports only positional replacements, such as

"select a, b from mytable where c='?' and d>'?'", [4, 5]

Should there be some support for named replacements, like

"select a, b from mytable where c='?val1' and d>'?val2'",
{val1: 4, val2: 5}

Note that this works more easily if there is some sort of limit on
what can replace a '?', so that it is possible to take anything next
to it (until whitespace or punctuation) as a name, rather than a
literal.

-jJ