picocli - runtime subcommand with options (no annotations)

Demo.java

import picocli.CommandLine;

import static picocli.CommandLine.*;
import static picocli.CommandLine.Model.*;

public class Demo {

  public static void main(String[] args) {
    CommandSpec rootSpec = CommandSpec.create();

    final String commandName = "determined-at-runtime-from-remote-source";
    rootSpec.addSubcommand(
        commandName,
        CommandSpec.wrapWithoutInspection(
                new Runnable() {
                  @Override
                  public void run() {
                    System.out.println("How do I access value of 'runtime-option-a'?");
                  }
                })
            .addOption(OptionSpec.builder("runtime-option-a").build()));

    System.exit(new CommandLine(rootSpec).setExecutionStrategy(new RunLast()).execute(commandName));
  }
}