custom unit definition cell

[MisterE123]

Sometimes I want to use EP.xyz as a unit converter including, for example, cost per gallon. Since there is no unit for $, I end up hacking it in by using a Volt or something instead of $.

Feature request: Have a custom unit definition cell, where one can define new units and create unit equivalencies to existing units. So, while it does not make sense to support whatever the current monetary conversion rates are between $ and pounds, this feature would allow me to define dollar as a unit and br_pound as a unit, and define a conversion between them.

[MisterE123]

So to clarify, I think a unit definition cell should allow one to add a new unit to one of the existing unit types and provide a conversion to base units, and allow definition of new unit types, along with a base unit, and further secondary units along with conversion factors to the base units.