Since there is NO weak aura that did what I wanted, I made one myself. I use Spirit of the Crane and Refresing Jade Wind.
It is a Misweaver DPS/Healing rotation helper for within Flex/Mythic raids.
It checks if there are 2 or more players in range for Essence Font use before reccommending it (30yd) It checks if there are 3 ore more players in range for Refreshing Jade Wind before recommending it (10yd) It only reccomends Blackout kick when you have 3 stacks of ToM It prefers Rising Sun Kick before Blackout Kick because of the potential refresh of Rising Sun kick. Rising Sun kick is only recommended to you if you have atleast something to extend (so renewing mist/essence font up)
It leaves out some spells if you fall below 25% mana so you will NEVER go OOM if you follow the rotation while maintaining as much HPS possible. With descent mana regen and below 25% mana the uptime of Essence Font should not suffer too much.
It does NOT reccommend direct heal usage, because that is dependend on whatever is needed. So use your Vivify and Enveloping Mist accordingly.
TLDR; It will reccomend the BASIC low uptime heals and prefers DPS when there is nothing to heal and it will scale up EF and RJW when there are actually damaged players within range.
Since my guild stopped raiding I have not tested this extensively, but as soon as we start again in 9.2 I will keep it updated and am open for some changes (like heal tresholds)