Bright and dustiest stars in the JWST era: powerful tools to constrain the recent star formation history

With the advent of the JWST, the horizon of our knowledgies will be amazingly enlarged, providing an unprecedent look of a large volume of galaxies with a broad properties range. This will be possible in the IR domain where the extinction is low and bright cool evolved stars have their emission peak. This is the case of asymptotic giant branch stars (AGB), luminous objects and main dust producers for the galaxy. We present how the large release of AGB+dust evolutionary models developed in the last years, will enable a detailed study of these sources in different systems. The distribution of these objects in the IR colour-magnitude diagrams is a powerful instrument to determine the recent star formation history of the galaxy in detail.