The Adif development group added a mode called Dynamic and SUBMODES for Vara. Reference: http://adif.org.uk/313/ADIF_313.htm
I reached out to ARRL LOTW asking when these will be added and they advised
“Modes like Dynamic and its Submodes will be reviewed by the ARRL-LOTW committee in coming weeks for potential inclusion in TQSL to allow such QSOs to be uploaded to LOTW”
Last feedback received was adding modes impacts awards. It sounded liked details were being worked.
I just send a follow up email to W9JJ who is over radio sports at ARRL
I would encourage others to contact him to express support for adding DYNAMIC mode (for VARA)