'Send register name to mapped command

I made this command to send my current buffer's file path into the + register:

:nmap <Leader>yp :let @+=expand("%:p")<cr>

I'd like to extend it so that the user choose the register to send to when calling <Leader>yp, but I'm not sure how.

If there's a way to "capture the selected register", can I use it into my command to then allow something like "a<Leader>yp? Thanks!

vim vi neovim

Solution 1:^[1]

Thanks to romainl comment, I came to this solution:

:nmap <Leader>yp :call setreg(v:register, expand("%:p"))<cr>

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Solution 1