Plotly express: format x-axis to show daily plot

i’m using plotly express to draw a scatter plot, the x-axis is the column ‘ds’ which is of type str, and is the date of the dataset(e.g. 20190511, 20190512, etc)
however, plotly seems automatically converted it into int type and changed the granularity of the axis.
how cant i change this to make it plot one point per day just as the underlying dataset carries?

Plotly’s libraries recognize dates formatted in ISO format, so yyyy-mm-dd, and in addition to that, if the input is a data frame such as with Plotly Express, columns of type date rather than string.