I extend the capacity of boot-image-template.img.gz, now the total is 256M, 177M for the 1st partition and 75M for the 2nd partition.
https://github.com/Donxu82/redpill-load/tree/develop/ext
It works fine.
Anyone who wants have a try, edit the global_config.json as follows:
"redpill_load": {
"source_url": "https://github.com/Donxu82/redpill-load.git",
"branch": "develop"