By design, Maestro discourages the usage of conditional statements unless absolutely necessary as they could easily ramp up the complexity of your tests.
Note that multiple conditions are applied as AND conditions.
Conditions
Supported conditions include:
visible: { Element matcher } # True if matching element is visible
notVisible: { Element matcher } # True if matching element is not present
true: { Value } # True if given value is true or not empty
platform: { Platform } # True if current platform is given platform (Android|iOS|Web)
All of the normal element matchers are supported, e.g.