I recreated the Cleric of Avalon from Gods & Goddesses in D&D Beyond, but I'm having some issues with one of the items:

Divine Justice
Beginning at 8th level, add your Wisdom modifier to all melee and ranged attack damage.

 Any thoughts on how to "automate" this in the subclass? Maybe I'm just not getting the syntax of the creation options, or maybe this is not an option that's even available. if I have to, I'll modify my player's weapons and everything when (if) he hits 8th level, but I'd love for it to be something that is built in, so neither of us forget to add it up and stuff later if his wisdom changes, or picks up a new weapon or something.

The subclass at version 0.5 is in moderation now, not sure if this link works: https://www.dndbeyond.com/characters/subclasses/5347-cleric-of-avalon

since I dunno if/when it'll get approved and not everyone may know this subclass I'm talking about, here's the whole subclass:

Clerics of Avalon are renowned healers. In fact, they are so famous that many seek the hidden portal to Avalon in order to uncover the secrets of healing. Attempts to enter the jealously guarded realm of Avalon have been thwarted, ending in the death of the interloper. As a cleric of Avalon, it is a Cleric’s duty to heal the sick, aid the downtrodden and banish undead and extraplanar evil from the realm of morals. Most importantly, they are the bearers of the knowledge of healing, and take this job seriously. To allow anyone into Avalon who is impure and unworthy of even standing upon its misty shores would be grounds for expulsion.

Alignments
Any Good Alignment, typically Lawful Good

Domain Spells
1st sanctuary, cure wounds
3rd gentle repose, spiritual weapon
5th beacon of hope, remove curse
7th control water, guardian of faith
9th mass cure wounds, greater restoration

Blessing of Avalon

At 1st level, you gain proficiency with martial weapons and heavy armor. While in heavy armor you gain +1 to all saving throws

Waters of Vivienne

At 2nd level, you may use your Channel Divinity to bless waters for healing purposes. Water is retrieved from a pure water source to be stored in a skin or other appropriate vessel. Water sources can be a small pond or an enormous lake so long as the water is fresh. This water instantly restores 10 hp when consumed.

The amount of full water skins which can be created per day is equal to your wisdom modifier. If the water is not ingested within 48 hours, the magical effects are nullified and the water cannot be re-blessed; only fresh water from a suitable source can be blessed.

Lesser Regeneration

At 6th level, you may use your Channel Divinity to touch a single willing creature. The affected creature will regenerate hit points equal to your wisdom modifier at the end of every one of their turns for one minute. If the recipient is reduced to zero hit points, the spell ends. Note: Lesser Regeneration does not grant, or recover temporary hit points.

Divine Justice

Beginning at 8th level, add your Wisdom modifier to all melee and ranged attack damage.

Prayer for the Fallen Warrior

At 17th level, as a reaction once per day, when an ally within 30 ft of you is reduced to 0 or fewer hit points, you may renew the spirit of your ally with the will to fight on. The target regains half of her hit points, and can stand as a free action. Also on her next action, she has advantage on attack rolls.

You should be able to give WIS modifier bonus damage to attacks by adding one modifier and selecting "Bonus" -> "Attacks" -> WIS or adding two modifiers and select "Bonus" -> "Melee weapon Attacks" -> WIS and "Bonus" -> "Ranged weapon Attacks" -> WIS (I give two options because I do not remember if there is a generic "Attack" sub-modifier, and cannot check now due to the internal error 500 when trying to create a subclass).

You also mention that this is from Gods and Goddesses. If that’s copyrighted material, it will be rejected.