Open Interest for multiple futures contracts

[Tsw85]

Good Day!

Can someone please help with a code to add open interest for two futures contracts?

For example: /ESZ24 + /ESH25

I would like to add the open interest for these and plot a line to show if total /ES open interest is truly increasing/declining or if contracts are being rolled into future expirations.

Thank you!

ST

 

[Joshua]

declare lower;
Plot x = open_interest("/ESZ24:XCME");
Plot y = open_interest("/ESH25:XCME");
plot z = x + y;

Only works on Daily+