Proposal now introduces a new serialiation format, please reuse existing ones.
Serialization of the amount of tokens transferred is not in a format that is used in Bitcoin.
Please don't introduce yet another serialization format, it is not very relevant how much better or anything it is, so please don't take this as critisism of the chosen format.
Simply don't introduce a new serialization format, VARINT is fine for this. Docs for VARINT are here: https://flowee.org/docs/spec/formats/variable-length-integer/