Currently you can't limit the elytra flying.

{
"type": "origins:elytra_flight",
"render_elytra": true,

"condition": {
	"type": "origins:in_rain",
	"inverted": false
},

"hidden": true
}

This should prevent you from flying unless it is raining. But the Elytra is only unrendered. The power remains. This code prevents you from flying in Fabric but not in Forge.