In the end, it is best to let your taste buds decide how much dried oregano you should use in your recipe. Also keep in mind that a packet of dried oregano that has been lying on your shelf for several months provides less flavor than a packet of oregano that you have purchased recently.
You can certainly choose a CMYK or HSL dialog in the fill and stroke and all colour pickers, but it converts all colors to 8 digit hex as you willl see in the bottom of the picker. Since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them.
1 If Edit > Color Settings is set to Adobe RGB (in InDesign), set it back to sRGB (or just use the North America General Purpose 2 preset).  If you have an InDesign document that was created while Color Settings was set to Adobe RGB and you want to change it to sRGB: Choose Edit > Assign Profile and choose sRGB there.