Aescripts Add Edit Markers Video Assets – Effects, Templates, Plugin, Transitions, LUTs : After Effects Plugin – Free Download
Will add Layer or Comp markers at the in and out points of the selected layers in a comp.
This stuff works with After Effects 2021, 2020, CC 2019, CC 2018, CC 2017, CC 2015.3, CC 2015, CC 2014, CC, CS6
Files include is After Effects Plugin Files
Aescripts Add Edit Markers Preview: