Thanks Sam , with a slight change it worked for the css:
.cooked ol { list-style-type: arabic-indic ; }
for the input part, where users need to switch to Persian/English to add numbers and text; before updating the commonmarks, one should only add the first number, and then add - for the rest of the numbers. but now all the numbers should have been written.
I think this is a feature for markdown-it, Marker character change forces new list start. Meanwhile is there any shortcuts (or tricks) I may have missed in the way one can use this numbered-lists in markdown-it without explicitly inputting all the numbers?