While there is a Component Export option for plug-ins, that is not the case for Component Settings at the application level (e.g. for Dynamic Actions) - which you will need if you have defined them for plug-ins. No idea why this is not included, but it's been like that for years.
The complete Application Export does contain them (in the "application/plugin_settings" section), so you can perform a manual hack similar to the one described for Dynamic Translations here.

Hacking the export file is not very elegant of course, and if you need to export/import the settings often then that will get pretty boring as well.
The script below copies the plug-in settings from the default values defined for all plug-ins. It will not overwrite any existing plug-in settings, so it is safe to run multiple times.

Note: The solution below will not work in Apex 24.2 and later.
As of Apex 24.2, columns attribute_01 through attribute_25 now return null in some Apex views, including apex_appl_plugin_settings which is used here.
You can query these attributes by reading the attribute's JSON column - see Apex 24.2. Desupported Features for more info.

declare cursor c_pln_pae is select pln.application_id , pln.name , psg.plugin_setting_id , pln.plugin_type , max( case when pae.attribute_sequence = 01 then coalesce(psg.attribute_01, pae.default_value) end ) as a_01 , max( case when pae.attribute_sequence = 02 then coalesce(psg.attribute_02, pae.default_value) end ) as a_02 , max( case when pae.attribute_sequence = 03 then coalesce(psg.attribute_03, pae.default_value) end ) as a_03 , max( case when pae.attribute_sequence = 04 then coalesce(psg.attribute_04, pae.default_value) end ) as a_04 , max( case when pae.attribute_sequence = 05 then coalesce(psg.attribute_05, pae.default_value) end ) as a_05 , max( case when pae.attribute_sequence = 06 then coalesce(psg.attribute_06, pae.default_value) end ) as a_06 , max( case when pae.attribute_sequence = 07 then coalesce(psg.attribute_07, pae.default_value) end ) as a_07 , max( case when pae.attribute_sequence = 08 then coalesce(psg.attribute_08, pae.default_value) end ) as a_08 , max( case when pae.attribute_sequence = 09 then coalesce(psg.attribute_09, pae.default_value) end ) as a_09 , max( case when pae.attribute_sequence = 10 then coalesce(psg.attribute_10, pae.default_value) end ) as a_10 , max( case when pae.attribute_sequence = 11 then coalesce(psg.attribute_11, pae.default_value) end ) as a_11 , max( case when pae.attribute_sequence = 12 then coalesce(psg.attribute_12, pae.default_value) end ) as a_12 , max( case when pae.attribute_sequence = 13 then coalesce(psg.attribute_13, pae.default_value) end ) as a_13 , max( case when pae.attribute_sequence = 14 then coalesce(psg.attribute_14, pae.default_value) end ) as a_14 , max( case when pae.attribute_sequence = 15 then coalesce(psg.attribute_15, pae.default_value) end ) as a_15 from apex_appl_plugins pln join apex_appl_plugin_attributes pae on pae.plugin_id = pln.plugin_id left join apex_appl_plugin_settings psg on psg.application_id = pln.application_id and psg.plugin_code = 'PLUGIN_' || pln.name where pln.application_id >= 10000 -- adjust this clause if needed and pae.attribute_scope = 'Application' group by pln.application_id , pln.name , psg.plugin_setting_id , pln.plugin_type order by pln.application_id , pln.name ; l_workspace_id apex_applications.workspace_id%type; begin for r_pln_pae in c_pln_pae loop -- set_security_group_id if needed if l_workspace_id is null then select workspace_id into l_workspace_id from apex_applications where application_id = r_pln_pae.application_id ; wwv_flow_api.set_security_group_id(l_workspace_id); end if; wwv_flow_api.create_plugin_setting ( p_id => wwv_flow_api.id(r_pln_pae.plugin_setting_id) , p_flow_id => r_pln_pae.application_id , p_plugin_type => upper(r_pln_pae.plugin_type) , p_plugin => 'PLUGIN_' || r_pln_pae.name , p_attribute_01 => r_pln_pae.a_01 , p_attribute_02 => r_pln_pae.a_02 , p_attribute_03 => r_pln_pae.a_03 , p_attribute_04 => r_pln_pae.a_04 , p_attribute_05 => r_pln_pae.a_05 , p_attribute_06 => r_pln_pae.a_06 , p_attribute_07 => r_pln_pae.a_07 , p_attribute_08 => r_pln_pae.a_08 , p_attribute_09 => r_pln_pae.a_09 , p_attribute_10 => r_pln_pae.a_10 , p_attribute_11 => r_pln_pae.a_11 , p_attribute_12 => r_pln_pae.a_12 , p_attribute_13 => r_pln_pae.a_13 , p_attribute_14 => r_pln_pae.a_14 , p_attribute_15 => r_pln_pae.a_15 ) ; end loop; end;