How to get instant value inside query which contain not instant value

Hi, i’m new to Grafana and prometheus. I’m trying to achieve query like (instant value * non instant value). I tried to use @ end() but got an error
"2:25: parse error: unexpected character: '@'"
Also i tried to separate queries and enable “instant” checkbox, but i’m not able to use query result in my expression. So, is there any another ways to achieve my goal?

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