In Primal, yes. In Nostur, you can edit the existing feed to add or remove contacts. Hopefully nostr:nprofile1qqs9xtvrphl7p8qnua0gk9zusft33lqjkqqr7cwkr6g8wusu0lle8jcpzemhxue69uhhyetvv9ujuurjd9kkzmpwdejhgqghwaehxw309ahx7um5wgh8qctjv46x7tn5damkuaa68e2 has this feature on their radar