How get arc center point in RF legs?

Hello, I am doing an rnav procedure for my airport guided by a chart but I came across an RF leg, and for this to work I need the fix center of the rf but I don’t know how I can find the coordinates of the center, is there a tool or something?

If there’s no information on the centre fixes and the authority won’t provide it to you, you can try find them by geometrical means. The centre fix has to be tangent to the leg at each end of the RF leg, so a little math can get you there. Another way, if the centre fixes actually already exist in the sim nav DB (often they do), is to eyeball them or draw them over a screenshot from LitteNavMap.