pause - resume

I've been trying to get my head around the pause and resume macros within ratos.
I noticed they don't either reduce the hotend temp or turn it off during a pause.

I often have a roll runout during the night and it could sit for hours.

I've tried putting:
M109 S{params.EXTRUDER_TEMP|default(printer.extruder.target, true) }

In the resume but I can't get it back to the gcode file extruder temp. Bringing the temp down in the pause was obviously the easy part.

Is there anywhere with more information on the params and the part in brackets id like to learn more of code in detail.
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