Short answer: yes. But what do the original "straight lines" mean now? they cannot be defined in a nice way in the new metric, because the natural geometric entities now are geodesics, and a quadrilateral of four right angles does not exist (apart from possible special choice of corners). You must define your volume in a correct way (see below)
Long answer: To answer your question in precise terms we should have the metric of a universe with positive cosmological constant and a black-hole, which actually isn't hard to solve!
The solution is a nonlinear amalgam of de Sitter and Schwarzschild metrics:
$ds^2 = - \left( 1 - \frac{r_s}{r} - \frac{\Lambda}{3} r^2 \right) dt^2 + \frac{dr^2}{\left(1 - \frac{r_s}{r} - \frac{\Lambda}{3} r^2 \right)} + r^2 d\Omega $
(note: if you want the size of your black hole to be considerably smaller than your universe, so you may expand the spacial part of the metric $d\,\vec{r}^2 = d\,\vec{r}^2_{schwarzschild} - \frac{\Lambda}{3}\frac{r^2 dr^2}{\left(1 - \frac{r_s}{r} \right)^2}$
)
So now in order to find the amount of dark energy in any spatial volume, you must specify the boundary of this volume element in a specific frame of reference, because spacial volume is "not a relativistic invariant". The natural frame for us is that of an observer comoving with the black hole and asymptotically away from it. For such observer you now define the boundary of a volume $\mathcal{V}$, and compute the latter as
$\mathcal{V} = \int_\mathcal{V}\frac{r^2 drd\Omega}{\sqrt{1 - \frac{r_s}{r} - \frac{\Lambda}{3} r^2 }} $
Finally the amount of dark energy in a certain volume define appropriately is $E = \Lambda\mathcal{V}$
Important note: This coordinate system is natural to define a volume specified by specific distances for example from the black hole singularity (boundary of which defined as a surface $r(\theta,\phi)$), this is why the answer is time independent. However if you want to define the volume by the position of comoving stars in de sitter, the volume will be exponentially increasing as $e^{\Lambda t}$, and you will have to use a coordinate system different from the one presented, convenient for picking time slices, and you will, as typical for de sitter space have and exponentially increasing amount of dark energy in a volume defined this way.
