Please, can I with help of Javascript change spot color values? for example by my color VARNISH with c:0,m:10,y:15,k:0 to make change to c:0,m:0,y:0,k:0? thank you

Please, can I with help of Javascript change specific spot color values? for example, I have color named VARNISH with values c:0,m:10,y:15,k:0 and it would help me to make change to c:0,m:0,y:0,k:0 as a part of an action. Is it possible? Thank you