[NTG-context] Question to footnote settings

Hi all, I am struggling with the width of a footnote number area. I would like to ask how can I set it dynamically based on the width of the largest number on a given page. Without width I get two different footnote texts widths (compare #9+10). With width there is a redundant space on the left (see p. 1). (Number alignment to the right is required.) Thanks in advance for some hints. Tomáš MWE: \setupnotation[footnote][ alternative=left, width=1em, numbercommand={\hfill\high}, ] \starttext \showframe[text][text] \dorecurse{6}{This is a text.\footnote{\dorecurse{12}{Blah blah blah. }} } \page \dorecurse{6}{This is a text.\footnote{\dorecurse{12}{Blah blah blah. }} } \stoptext