I think the question was:
Why is it not a standard functionality of the sequencer? Since it is already possible for static meshes.
And I have to admit I am interested in this too.
@YuuJin Thank you for a possible solution.
Having an additional BP/script like in the meercat demo, scanning for actors with specific tags, will have a performance cost. This could be safed by having the LoD property exposed for the sequencer.