Hi @Anonymous ,
Do you want to generate a picture based on start date and end date like the pic that you showed?
I'm afraid it's not supported to generate picture like your picture by using data in table directly currently in powerapps.
However, I've found an alternative way to display data like your picture.
I suggest you try to use gallery, which could change the label's color based on its data.
I've made a similar test for your reference:
1)Firstly, you need to generate a collection based on start date and end date:
ClearCollect(a,AddColumns(b,"jan",If(Month(startdata)=1||Month(enddata)=1,true,false),"feb",If(Month(startdata)=2||Month(enddata)=2,true,false),"mar",If(Month(startdata)=3||Month(enddata)=3,true,false),.....))
In this way, you will generate a collection will the data of month.If the project's work time is within this month, its data is true.Or else. its data is false.
Just like this:

2)insert a gallery, insert 12 labels inside the gallery.
Set label1's Text:
ThisItem.jan
set label1's Fill:
If(ThisItem.jan=true,Blue,White)
Set label2's Text:
ThisItem.feb
set label2's Fill:
If(ThisItem.feb=true,Blue,White)
.....
Insert 12 lables outside the gallery, set their Text like this:
"jan-2020" "feb-2020" ,.......
Then you will get data like the picture:

Best regards,