Multiply item values (without rule) in OH3


I want to multiply two item values in OH3 and searching for a solution without creating an extra rule for it.
I tried to create a group and add the two items as members. But there are only SUM, AVG, MIN, MAX as aggregation functions available.

Is there a possibility to multiply item vaules without creating an extra rule?


Nope. Non-rule processing methods like transformations only allow for one Item state as input.
Where would you put the result, anyway? Some third Item? Or is this only about some UI display?

For my case it would be enough to aggregate the vaule in a group item. I tought there is a way I can’t find, but then I have to write a new rule.