[j_cool]

The whole syntax is in batch file. Referer is https://noob4cast.com/ and it doesn't change.
Hls url is changing.

set referer="Referer=https://noob4cast.com/"
set url="https://s6.merizaat.com:8080/hls/hdchnl1.m3u8?md5=hU_czdD3GkayEi1VmXKKXw&expires=1662860389"
streamlink.exe --http-header %referer% %url% best

is the same as:

streamlink.exe --http-header "Referer=https://noob4cast.com/" "https://s6.merizaat.com:8080/hls/hdchnl1.m3u8?md5=hU_czdD3GkayEi1VmXKKXw&expires=1662860389" best

Run this url in Chrome:

http://gy.freestreams-live1.com/bbc-one/

Press F12, select "Network" tab, right click on m3u8 url:

'https://s6.merizaat.com:8080/hls/hdchnl1.m3u8?md5=F4iCbjwhgKLTLqT7JJ2cqA&expires=16 63116671'

select "Copy" > "Copy as fetch"

Then open Notepad, and paste (content from clipboard). You get this:

fetch("https://s6.merizaat.com:8080/hls/hdchnl1.m3u8?md5=F4iCbjwhgKLTLqT7JJ2cqA&expires=1663116671", {
  "headers": {
    "accept": "*/*",
    "accept-language": "en-US,en;q=0.9",
    "if-modified-since": "Tue, 13 Sep 2022 22:51:41 GMT",
    "if-none-match": "\"6321097d-218\"",
    "sec-ch-ua": "\"Google Chrome\";v=\"105\", \"Not)A;Brand\";v=\"8\", \"Chromium\";v=\"105\"",
    "sec-ch-ua-mobile": "?0",
    "sec-ch-ua-platform": "\"Windows\"",
    "sec-fetch-dest": "empty",
    "sec-fetch-mode": "cors",
    "sec-fetch-site": "cross-site"
  },
  "referrer": "https://noob4cast.com/",
  "referrerPolicy": "strict-origin-when-cross-origin",
  "body": null,
  "method": "GET",
  "mode": "cors",
  "credentials": "omit"
});

All this can be done with script and that is what I ment by quote: How easy you get it depends on your skill.
Hls url is changing and doing this without scripting skills is a pain.