Hello @drirgang,
Below steps will help you to change the colour of hyperlink without change in html code, you can directly change the colour from editor, this will help you a lot.
Steps:
1. Select a text where you have given a hyperlink.
2. Click on down arrow in Block Toolbar https://prnt.sc/eLubAC_IRyYO
3. Select the Highlight option https://prnt.sc/5Y4i5fmYpslr
4. Select the colour you want to select for the text https://prnt.sc/uz1XPMRhfQ4A
Thank you.