Specify format for adding segments to the mogrify filter in AdminFE

There is no documentation that specifies how to format multi-part segments in the mogrify filter settings in AdminFE. Before using the config-in-DB, my working mogrify settings were ["auto-orient","strip",{"resize","3840x1080>"}]. The auto-orient and strip segments continue to work. I've tried all of these for the resize segment to no effect (or even a useful error message):

resize 3840x1080>
'resize 3840x1080>'
"resize 3840x1080>"
resize '3840x1080>'
resize "3840x1080>"
'resize "3840x1080>"'
"resize '3840x1080>'"
{"resize", "3840x1080>"}
{'resize', '3840x1080>'}
'{"resize", "3840x1080>"}'
"{'resize', '3840x1080>'}"