Multiple configurations in a container

Say I had two rom configurations:

http_configuration = ROM::Configuration.new(:http, {
  uri: 'http://jsonplaceholder.typicode.com',
  headers: {
    Accept: 'application/json'
  },
  handlers: :json
})

sql_configuration = config = ROM::Configuration.new(:sql, 'postgres://localhost:5432/mydbname', opts)


How could I create a container that would be have access to the relations in both configs?

ROM.container(sql: sql_configuration, http: http_configuration) # this doesn't work, just pseudo-code