Problem with the semantics of "select into" in a plpgsql function

Greetings,
I have a plpython function that returns a set of records. I loop over them
to insert them into a temp table created by another function.
I wanted to test
select into temp_eav_table (column) select a.column from tbl as a where....
approach to see if it performs better than the loop. However, I'm not able
to compile the function due to an error that says "temp_eav_table is not a
known variable"

So the context assumes this is supposed to be a variable. If I try execute
'...', then I have trouble passing a bytea parameter to the python
function. This is what I have at the moment:

SELECT INTO temp_eav_table (valstring,
featuremappingid,
featurename,
rmtypename,
actualrmtypename,
path,
pathstring)
select selected_node.valstring,
selected_node.featuremappingid,
selected_node.featurename,
selected_node.rmtypename,
selected_node.actualrmtypename,
selected_node.path,
selected_node.pathstring
from py_get_eav_rows_from_pb(payload ) as selected_node;

any thoughts?

Best regards
Seref