Extra css for forum_ids in options?

How can I have aconnection between

add-on options <edit_format_params>\XF\Option\Forum::renderSelectMultiple</edit_format_params>[(icode]
and my extra css?

Like if node_id in options, then css:

xyz_value = 100%
else 50%

Normally i use something like

[CODE][data-container-key="node-1"], [data-container-key="node-3"]
{[/CODE]

if i need extra css for less specific nodes/forums,

but now i have to connect the forum_id from the options with the extra css?
Any idea or an add-on...

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