Is there a way two define a search space with functional relationship between individual dimensions?

[wushanyun64]

Hi guys,

I am wondering if there is a way to define a search space in skitopt that the dimensions are dependent on each other?
For example:
Let's say we have a 2D search space with dimensions x1 and x2. Now skitopt support the boundary definition for each dimension individually, such as:
0<x1<10, 0<x2<5.
But can we also define something like:
0<x1+x2<10?

Is it something currently possible in skitopt? If not, any idea how to implement this?

Thanks in advance!