Why not, blockchain isn't meant for bitcoin alone, other companies and organizations including government can make use of blockchain for their secured means of storage that is immutable and decentralized, we already have many brands names hat have their original products listed on the blockchain, services and commodities with their respective prices as well, they uses blockchain because they believed it's a technology that cannot accept any form of alterations on the data it comprises.
Good idea. Many have expressed this before. The problem is that the voting machines are interfered with through the Internet. And this is done on purpose by governing officials who set up the technical part of the election.
What this means is that the connections between the voting machines and the election control center are the problem. The vote by any citizen can be diverted from going to the control center, and replaced by an impulse that looks like the vote but isn't. The whole control center could be corrupted to make it look like a good vote.
In the US, the voting machines are open to hacking and corruption because they are on the Internet. This hacking was part of the way that Trump and Kari Lake lost their elections. However, blockchain would be a start, and would make it more difficult for crooks to hack elections.
The real thing that needs to be done is to get the corrupt election people out of there, and replace them with honest people. What Stalin said still holds true, "The people who cast the votes decide nothing. The people who count the votes decide everything."