Setting up secrets without direct access to files

I'm using Portainer on my server.
In Generate API Keys section (https://supabase.com/docs/guides/hosting/docker#generate-api-keys) it's said that you need to replace anon and service keys in volumes/api/kong.yml, however I can't really do that.
In Portainer, you can create a stack using docker-compose.yml, but you can't load files directly for a stack (ie. volumes/api/kong.yml).
Any suggestions?
How to configure and deploy Supabase.
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