An Option to Stop Creating New Animation Data When Importing VMD

[rintrint]

In MMD, importing multiple VMD or VPD files will merge them seamlessly. I want to achieve a similar result in Blender.

Currently, when using mmd_tools, importing a VMD file always creates new animation data instead of merging the keyframes with existing data. I hope there can be an option to merge keyframes when importing VMD files. Instead of creating a new animation data.