Ability to run script commands against services in Bitbucket Pipelines

Currently, it is not possible to do any setup to services in Bitbucket Pipelines. However, it would be nice to be able to add seed data or run other kinds of commands before using the service in the main step script.

For example:

image: dotnet
pipelines:
default:
- step:
services:
- database
script:
- dotnet restore
- dotnet build

definitions:
services:
database:
image: mongo
<it would be really nice if I could add setup steps here>