https://forums.freebsd.org/threads/newsboat-rss-reader-enable-vim-key-bindings.69448/

newsboat.config

# general settings
auto-reload yes
max-items 50

# externel browser
browser "/usr/local/bin/w3m %u"
macro m set browser "/usr/local/bin/mpv %u"; open-in-browser ; set browser "/usr/local/bin/w3m %u"
macro l set browser "/usr/local/bin/firefox %u"; open-in-browser ; set browser "/usr/local/bin/w3m %u"

# unbind keys
unbind-key ENTER
unbind-key j
unbind-key k
unbind-key J
unbind-key K

# bind keys - vim style
bind-key j down
bind-key k up
bind-key l open
bind-key h quit

# solarized
color background         default   default
color listnormal         default   default
color listnormal_unread  default   default
color listfocus          black     cyan
color listfocus_unread   black     cyan
color info               default   black
color article            default   default

# highlights
highlight article "^(Title):.*$" blue default
highlight article "https?://[^ ]+" red default
highlight article "\\[image\\ [0-9]+\\]" green default