There doesn't seem to be a way to specify or include dependencies

[regner]

Is there a way to do that without managing a new set of templates?

[mh-cbon]

the solution you implemented is probably the only way to solve this at that moment.

For reference to future readers https://github.com/Regner/albiondata-client/commit/4976f0e653d1171d97185bdf26c58ef593ec58e7

To implement that via wix directives, you can check that SO: https://stackoverflow.com/a/19849362/4466350

But, this works only for msi, and the file you added is not [INSTALLDIR]/thirdparty/WinPcap_4_1_3.exe.

Thus, i already wonder if that worth to add a sort of third-party-msi-to-install key to the json.