Google Sheets – How to Show Unique Values from a Column in a Pie Chart

Perhaps the =Unique(A1;A2) function might be helpful to you?

http://woorkup.com/2010/02/19/10-useful-google-spreadsheet-formulas-you-must-know/

Otherwise there was this script from a previous answer on another SE site.

https://webapps.stackexchange.com/a/21699

Possible but may require some 'compromising':

=arrayformula(right(split(FILTER(B3:B, A3:A>0, LEN(B3:B)>0), ","),1))  

in D1 to F10 does find the 2 (which should have been 'underneath' where you put your formula for the purposes of your example) - it also strips out Value, though this could be added back later if required.

in say G1 and copied down to suit:

=arrayformula(LARGE(value(D$1:F$10),row()))  

then with all your values in a single column, in say H1 and copied down to suit (upto #NUM!):

=unique(G:G)  

The results will be in reverse order from as shown by you (sort?) because of use of LARGE rather than SMALL because if positive values only all the 0 would have come first and there are quite a few of those.

Concatenate results with ="Value "&H1 etc if required.