Batching writer.append steps

Hey there. Is it possible to batch the `writer.append` command (e.g. extend) in Reverb? I am currently doing something like the following:

```
for exp in exps:
self._writer.append(exp)
```
Where I loop over 400 steps with quite large observation sizes. I am also using Launchpad. It seems that this append is taking about 20% of the episode computation time. Is there something like writer.extend in Reverb or some other fancy method to maybe do only one write for a batch of steps for improved performance? Should I maybe try and just skip the `writer.append` and directly try and create trajectories from the concatenated episode steps? Thanks.