Escape > Interface > Name > Personal Resource Display. It looks like this i.imgur.com/h9dOq9C.jpg
, a Health/Mana frame under your feet, but what matters is the tiny icon of Flash Concentration, with the number of stacks and the remaining duration through rotating brightness, it fades out when out of combat.
It is not as detailed as WeakAuras or audible but it gets the job done and I am now used to it. It was enough to get Shadowlands Keystone Mister in a week, using it. It is still far better than looking at the top right corner.
Sometimes it gets hidden behind my party frames if I am looking up.
Stan Flash Concentration! Holy Priest is freelo in Mythic+!
Why not just use WeakAuras? Prehistoric computer. I need all the RAM I can get.