Ways to mark a thread as special

[Robert9]

I can add a field to xf_thread and set it to default 0.
For some less threads I set it to 1. Now, these threads are special.

I can add an option to an add-on; there I add some thread_ids;
now I need to get/set the information that a thread is special, when the thread_id is in my options list.

I can do
foreach options.array_of_thread_ids as id
if thread_id == id, do


But can I do in a template:
$array = options.array_of_thread_ids
is thread_id in array?
Ways to mark a thread as special

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