Calculate 1/(A+B) in a filter

Given that A and B are fields, how do I calculate 1/(A+B) in a filter?

We can use the negative exponent property : 5.6: Negative Exponents - Mathematics LibreTexts

{{{ [{!!A}add{!!B}power[-1]] }}}

Other option with map:

{{{ [{!!A}add{!!B}]:map[[1]divide{!!title}] }}}

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