how to change the defualt delimiter : after the page number

[Shallow-Seek]

I use rga to search for string in pdf. I found that field-match-separator won't change the delimiter :.

For example with this command

rga --color=always --no-heading --smart-case --glob='*.pdf' --field-match-separator $'\u00a0' --context-separator $'\u00a0' "" | fzf --ansi --delimiter $'\u00a0'

I will still have filename page 123:context.
Is there an option to define the delimiter replacing the : after page 123?
Thanks.