don't know if you mean completely unrequited for the childhood friends but here:
https://www.mangago.zone/read-manga/keep_holding_on/ (childhood friends get together, not actually unrequited)
https://www.mangago.zone/read-manga/cosmic_boy/ (childhood friends get together, not actually unrequited)
https://www.mangago.zone/read-manga/heesu_in_class_2/ (childhood friends don't get together, mc has a different love interest)
https://www.mangago.zone/read-manga/shining_summer/ (a bit complicated, but mc had unrequited feelings for his childhood friend, said friend appears again but it isn't him but someone else in his body)
https://www.mangago.zone/read-manga/hush_today/
https://www.mangago.zone/read-manga/for_your_love/
https://www.mangago.zone/read-manga/konosaki_wa_futarikiride/
https://www.mangago.zone/read-manga/kimi_ni_wa_todokanai/
https://www.mangago.zone/read-manga/ao_no_flag/
https://www.mangago.zone/read-manga/usagi_no_mori/
please recommend some onesided love on childhood friend tropess