First, for love marriage matching of charts is not a necessity since it is a fusion at the mental level. Generally, if one has the dosha and the other doesn’t, the one with the dosha is advised to marry a tree (in some places even a pot is used) for the first marriage (Kanda Vivaha) . The tree is cut (or the pot is broken or set to float in the river or sea) marking the end of first marriage. Then the regular marriage with the partner is done.
The local purohits will know the procedure.