For your use case, this configuration appears to be available from within the limits.conf file: https://docs.splunk.com/Documentation/Splunk/latest/Admin/limitsconf#.5Boutputlookup.5D [outputlookup]
create_context = user per the documentation: [outputlookup] create_context = [app|[user|system]
* Specifies the context where the lookup file will be created for the first time.
If there is a current application context and the following options,
file will be created under:
* app : etc/apps/<app>/lookups
* user : etc/users/<user>/<app>/lookups
Otherwise, file will be created under:
* system : etc/system/local/lookups
* Default: app
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