The Entity Token submodule for Drupal 7 provides support for chained tokens, so they can be used with entities referenced by fields. However, Backdrop's implementation of entity_token is very simple and doesn't include that, only chained url and original tokens are included.
This whole feature has been already requested in https://github.com/backdrop/backdrop-issues/issues/1440. However, that doesn't seem a straight-foward implementation. It's relying a lot on Drupal 7 Entity functions, such as entity wrappers and other utilities Backdrop doesn't have, or use the same way.
My approach here would be to start providing something simpler and more widely used, a taxonomy term reference field chained token.
For example, we can use the parents path in an alias pattern [node:_field_taxonomy_term_:parents:join-path]. We can provide this from the Field module.
Recent comments
We can no longer add contrib projects in the Tugboat sandboxes that we use for core PR's? Can this be fixed or is there a reason for this? We can add contrib projects to demo...
Apr 25th Weekly Meetings
The Mail System and MimeMail modules are now installed. I'll let you know if they solve the problem. Edit: Using Mail System with MimeMail I was able to send plain text emails. There is...
HTML Email treated as plain text
If you haven't already I recommend installing Mail System and MimeMail. The latter will help format emails as HTML and first helps with configuring which module will handle the formatting...
HTML Email treated as plain text