Is it permissible to send the name of the deceased and a supplication for them in a WhatsApp group, then send specific needs to encourage charity with the intention of fulfilling a need for the deceased?

There is no harm in sending a supplication mentioning the name of the deceased and advising others to pray for them via WhatsApp. Supplications for the deceased reach them by scholarly consensus. Their deeds continue after death through three things, one of which is a righteous child who prays for them. Likewise, there is no harm in mentioning some of the deceased's needs so that their family can fulfill them as an act of charity on their behalf, for charity reaches them by scholarly consensus.