Using Variables in dblink_build_sql_insert

Here is what I get from the documentation:

The last two arguments are:
text[] src_pk_att_vals_array,
text[] tgt_pk_att_vals_array
SELECT dblink_build_sql_insert('foo', '1 2', 2, '{"1", "a"}', '{"1",
"b''a"}');

How do I replace the src and tgt with variables from within my function? I
can easily create the insert statement with a true value, but if I loop over
a record and try to dynamically set the src and tgt I get errors.

declare

bob_record record;
frank character varying[];

for bob_record in select bob from table;
loop
frank = bob_record.bob;
SELECT dblink_build_sql_insert('foo', '1',1, '{"frank"}', '{frank"}');
end loop;

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