Iterative with connected inputs/outputs

iterative.nf

rawFastqs = Channel.fromFilePairs(['data/*_{1,2}.fastq.gz', 'data/*_R{1,2}.fastq.gz'])
databases = Channel.of(['label1', '/some/path/database'], ['label2', '/some/other/path/database'], ...)

/+
The general structure of what I'd like to achieve, just without manually putting in all of the someProcess() calls
That won't work for a variety of reasons, among them being that someProcess() would need an alias each time
*/
workflow {
  someProcess(rawFastqs, databases.first())
  someProcess(someProcess.out.fastq, databases[2])
  ...
  someProcess(someProcess.out.fastq, databases.last())
}

process someProcess {
  input:
  tuple val(sampleName), path(reads)
  tuple val(label), path(database)
  
  output:
  path "*.processed.fastq.gz", emit: fastq
  
  """
  some script processing reads through the database, noting the label for eventual reporting
  """
}
  

singleTuple.nf

rawFastqs = Channel.fromFilePairs(['data/*_{1,2}.fastq.gz', 'data/*_R{1,2}.fastq.gz'])
//N.B., this is a tuple of tuples
databases = Channel.of([['label1', '/some/path/database'], ['label2', '/some/other/path/database'], ...])

workflow {
  someProcess(rawFastqs, databases)
}

process someProcess {
  input:
  tuple val(sampleName), path(reads)
  val(tuple(val(label), path(database)))  // This doesn't work, there's a "no such variable: label" error
  
  output:
  path "*.processed.fastq.gz", emit: fastq
 
  shell:
  """
  Some script that iterates over the databases array
  """
}