Here is a Jewish blessing for someone coming out as asexual. It can be said and/or prayed by the person who is going to come out, or has come out, in this way:
“Blessed are you, Holy One, who has given me the ability to come out as asexual. May You give me the ability to always love and celebrate my asexual identity.”
It can be said and/or prayed to support the person who is coming out in this way:
“Blessed are you, Holy One, who has given [person’s name] the ability to come out as asexual. May You give [person’s name] the ability to always love and celebrate their asexual identity.”