Missed URL alias path token group for custom ECK entities

Each standard Drupal entity, such as node, user, taxonomy term, etc - have url token group that contains many tokens, based on entity url information.

For example node have those url alias tokens:

[node:url]
[node:url:unaliased]
[node:url:unaliased:absolute]
[node:url:unaliased:args]
[node:url:unaliased:brief]
[node:url:unaliased:relative]
[node:url:unaliased:path]
[node:url:absolute]
[node:url:args]
[node:url:args:value:?]
[node:url:args:keys]
[node:url:args:reversed]
[node:url:args:join-path]
[node:url:args:first]
[node:url:args:last]
[node:url:args:join:?]
[node:url:args:count]
[node:url:brief]
[node:url:relative]
[node:url:path]

But custom entities, created by Entity Construction Kit (ECK), provide no tokens, based on entity url alias, so ECK entities cannot be used as path part of Pathauto module.

How can I add url alias entities to custom ECK entities? Maybe this possible via some hack or external module?