rpi-imager.json formatting issue

@ncopa Pi Ltd just embedded rpi-imager.json in their master, but subitems do not show. It seems their deployment system does not like text fields escaping, and just scraps it all.

Current raw json is as follows:
{"os_list":[{"description":"Small OS for RPi 1 and Zero\/W","release_date":"2024-09-06","init_format":"none","url":"https:\/\/dl-cdn.alpinelinux.org\/alpine\/v3.20\/releases\/armhf\/alpine-rpi-3.20.3-armhf.img.gz","devices":["pi1-32bit"],"icon":"https:\/\/alpinelinux.org\/alpinelinux-logo-icon.svg","website":"https:\/\/alpinelinux.org\/","image_download_sha256":"17a36a7d84e483b6e81e6e6abc15a87be2e63018491e9dea5ad22e23fe8c22e7","name":"Alpine Linux 3.20.3 (32bit)","image_download_size":60921842},{"description":"Small OS for RPi 2 and 3","release_date":"2024-09-06","init_format":"none","url":"https:\/\/dl-cdn.alpinelinux.org\/alpine\/v3.20\/releases\/armv7\/alpine-rpi-3.20.3-armv7.img.gz","devices":["pi2-32bit","pi3-32bit"],"icon":"https:\/\/alpinelinux.org\/alpinelinux-logo-icon.svg","website":"https:\/\/alpinelinux.org\/","image_download_sha256":"a9bd3d3e5d291942e9932dd91771b289c0ba1b39db785d1582540e4a7068afe7","name":"Alpine Linux 3.20.3 (32bit)","image_download_size":60222594},{"description":"Small OS for RPi 3, 4 and 5","release_date":"2024-09-06","init_format":"none","url":"https:\/\/dl-cdn.alpinelinux.org\/alpine\/v3.20\/releases\/aarch64\/alpine-rpi-3.20.3-aarch64.img.gz","devices":["pi3-64bit","pi4-64bit","pi5-64bit"],"icon":"https:\/\/alpinelinux.org\/alpinelinux-logo-icon.svg","website":"https:\/\/alpinelinux.org\/","image_download_sha256":"1042ba109aaff6a10a74d589401ab1f55559739b8fad95c332ee1932542dd890","name":"Alpine Linux 3.20.3 (64bit)","image_download_size":66799033}]}

Sample Ubuntu json raw for reference