Is `config.sessionStartupCustom` possible on Workbench?

The Workbench Helm chart currently has a config.startupCustom key. For example:

https://github.com/rstudio/helm/blob/c48d94fda4562795ca9010f334c2c11271a8073f/examples/auto-scaling/rstudio-workbench/values.yaml#L148-L162

Would it be possible to have scripts that run when a IDE session starts? The motivation for this is a want to create a symlink on the session container before the IDE starts. For example:

config:
  session:
    repos.conf:
      RSPM: https://packagemanager.rstudio.com/cran/__linux__/jammy/latest
      CRAN: https://packagemanager.rstudio.com/cran/__linux__/jammy/latest
  sessionStartupCustom:
    symlink-odbc.sh: |
      #!/bin/bash
      ln -s /mnt/session-secret/odbc.ini /ect/odbc.ini
  sessionSecret:
    odbc.ini: |
      [ProjectAbcDatabase]
      Database=project_abc
      Driver=PostgreSQL
      Password=password
      Port=5432
      Servername=database-postgresql
      UserName=posit_team

Or maybe there is a way to already do this?

Start with the Workbench Helm chart values.yaml example at the linked lines and trace how config.startupCustom is handled. Determine whether an equivalent sessionStartupCustom setting can be supported for IDE session startup, and verify that the documented symlink example runs before the session starts.