[NTG-context] minimum number of dots in lists (TOC, LOF)

Hello list members: I have set up a document showing the table of contents with dots between section titles and page numbers. (\setupcombinedlist[content][level=3,alternative=c]) Some of the titles are longer and between the title and page number only one dot is inserted, which is not nice. Can it be controlled what is the minimum number of inserted dots (e.g. 3) or what is the minimum width of the distance where dots can be inserted? If the distance is less, empty space should be inserted instead. Is this possible? Thanks,