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”
Mode DATA has been in LOTW for some time. I have used this before but for a match for LOTW QSL believe the mode by both operators needs to match.