This was basically triggered by this forum post: https://forum.backdropcms.org/forum/how-set-selected-tag-form-select-opt...
As it is currently, you cannot easily add attributes to individual options of select elements, and it requires either a lot of theming work, or to port a module like https://www.drupal.org/project/form_options_attributes. Even with that module, things are not consistent, so we should consider backporting the D8 solution being worked in https://www.drupal.org/node/342316
GitHub Issue #:
4312
Recent comments
Tried and successfully applied DrAlbany's method with the form https://www.drupal.org/sandbox/grobot/2105379stickman hook. I also encountered the same situation. Thanks DrAlbany
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