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"\$.$row->{name}"

my $x = 'sent';
print "\$.${x}ence";

# output: $.sentence

"\$.${\$row->{name}}ence"

sprintf("\%.%s", $row->{name});

my $row = {name => 'sent'};

my $thing = sprintf("\$.%sence", $row->{name});

# output: $.sentence

    my $something_query = qq{
        SELECT COUNT(*) FROM Person 
        WHERE Account_idAccount = ?
        AND JSON_EXISTS(custom, ?)
    };

    my @array = $dbh->selectrow_array(
        $something_query, 
...
            $row->{name}
        )
    );