update a value in wp_options

This seams to be basic -but I don’t get it. If I query an option with get_option I get the string: [{"title":"Brand Primary","value":"#2185D0","_id":"627a0637cf178d93e50be224cc07cd6e"},{"title":"Brand Secondary","value":"transparent","_id":"017280d9ec94a585c2de0bee8f49d8fb"},{"title":"Typo normal","value":"#383838","_id":"ff77119a11466c8d7a0efd612109fe6a"},{"title":"Typo on Brand Base","value":"#383838","_id":"8a3c1eebb8067b37fc47fc505f44b8b4"},{"value":"rgb(255, 255, 255)","title":"Typo on Brand Active","_id":"66fe7ced-3ef8-4dac-92c7-568d604c2931"}] How can I change with php the value ‘#2185D0’ (Brand Primary) and ‘#383838’ (Brand base) without using this values by themselves (the … Read more