Just an update in case anyone else comes across this post - I found this plugin which allows me to put the inlay hints at the end of the line and it works great. Make sure to modify the display_callback to change how it looks.

sadly no; position of hint is determined by the LSP server.

you could use this plugin (now archived) which was the way many people used hints pre-0.10:

https://github.com/lvimuser/lsp-inlayhints.nvim