The best option I can think of is SAS/CONNECT. Viya includes SAS/CONNECT. but it comes as an add-on to SAS 9.4. With SAS/CONNECT you can use the PROC UPLOAD and PROC DOWNLOAD to move SAS data between SAS 9.4 and Viya. You can even remotely submit code from SAS 9.4 to Viya. To check if you have SAS/CONNECT installed and licensed in SAS 9.4 run this:
proc product_status;
run;
proc setinit;
run;