IRATE or RATE for a query with 2 inHCInOctets filters

Exporters and Metrics
1

Hi,
here is my simple query for CURL :

var query = “query='ifHCInOctets{instance=~"RIE-XXX-XX-XX.xx"} and ifHCInOctets{ifName=~"et-1/1/1"}'”

It works fine but I get the raw result.
How to write the formula to get the irate or rate ?

Thanks