It's possible to make two converters, like this, one that calculates A from B and one that calculates B from A:

But is there any way to make a converter where changing
any input updates the other inputs? So there's only one instance of A and one instance of B, and changing either of them updates the other? It would behave similarly to this:
https://www.analog.com/en/design-center/interactive-design-tools/dbconvert.html
In this converter, if you change any of the text fields, the other text fields update to match it.