Just in order that you understand related better, Librem 14 will not even recognize it is connected to the some power supply (at 13.6V), I might bet on this. Therefore only DC20V output from the JNS S31 IPS or from the MAXOAK K2 185Wh power banks, for example, would do the proper charging magic (with using adequate charging cable and adapter for the 4017 barrel jack).